# 2-2 Linear Relations and Functions. So the function is linear. State whether each function is a linear function. Write yes or no. Explain.

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1 State whether each function is a linear function. Write yes or no. Explain. The function written as. is linear as it can be + b. cannot be written in the form f (x) = mx So the function is not linear. is not a linear function as x has an exponent that is not 1. q(x) can be written in the form f (x) = mx + b. So the function is linear. 5. RECREATION You want to make sure that you have enough music for a car trip. If each CD is an average of 45 minutes long, the linear function m(x) = 0.75x could be used to find out how many CDs you need to bring. q(x) can be written in the form f (x) = mx + b. So the function is linear. 5. RECREATION You want to make sure that you have enough music for a car trip. If each CD is an average of 45 minutes long, the linear function m(x) = 0.75x could be used to find out how many CDs you need to bring. 6. a. If you have 4 CDs, how many hours of music is that? b. If the trip you are taking is 6 hours, how many CDs should you bring? a. m(x) = 0.75x Replace x with 4. m (4) = 0.75(4) = 3 Therefore, 4 CDs have 3 hours of music. b. Replace m with 6. 6 = 0.75x This implies: The number of CDs needed for a 6 hour trip is 8. CCSS STRUCTURE Write each equation in standard form. Identify A, B, and C. A = 4, B = 1, and C = 7. a. If you have 4 CDs, how many hours of music is that? b. If the trip you are taking is 6 hours, how many CDs should you bring? a. m(x) = 0.75x 7. esolutions Manual - Powered by Cognero Page 1

2 A = 4, B = 1, and C = Linear Relations and Functions A = 8, B = 9, and C = A = 6, B = 1, and C = A = 1, B = 3, and C = 2. C, where A, B, and C are integers with a greatest common factor of 1,, and A and B are not both A = 3, B = 2, and C = 1. A = 2, B = 3, and C = A = 8, B = 9, and C = Find the x-intercept and the y-intercept of the graph of each equation. Then graph the equation using the intercepts. Substitute y = 0 in the equation = 5x + 12 The x-intercept is. esolutions Manual - Powered by Cognero Page 2

3 2-2 Linear A = 2, B Relations = 3, and and C = 12. Functions 12. Find the x-intercept and the y-intercept of the graph of each equation. Then graph the equation using the intercepts. Substitute y = 0 in the equation. 13. So, the x-intercept is. So, the y-intercept is = 5x + 12 The x-intercept is. Therefore, the y-intercept is So, the x-intercept is So, the y-intercept is 4. So, the x-intercept is. So, the y-intercept is esolutions Manual - Powered by Cognero Page 3

4 In a linear function, the exponent of the independent variable is less than or equal to 1. No; x has an exponent other than So, the x-intercept is 7. So, the y-intercept is Yes; it can be written in f (x) = mx + b form, where m = 0 and b = 6. In a linear function, the exponent of the independent variable is less than or equal to 1. No; x has an exponent other than No; it cannot be written in f (x) = mx + b form. 16. State whether each equation or function is a linear function. Write yes or no. Explain. Yes; it can be written in f (x) = mx + b form, where and No; it cannot be written in f (x) = mx + b form In a linear function, the exponent of the independent variable is less than or equal to 1. No; x has an exponent other than 1. Yes; it can be written in f (x) = mx + b form, where m = 0 and b = No; it cannot be written in f (x) = mx + b form. No; it cannot be written in f (x) = mx + b form; There is an xy term. esolutions Manual - Powered by Cognero Page 4

5 The roller coaster travels 260 meters in 25 seconds. No; it cannot be written in f (x) = mx + b form; There 2-2 Linear is an xy Relations term. and Functions 24. Yes; it can be written in f (x) = mx + b form, where and. 25. ROLLER COASTERS The speed of the Steel Dragon 2000 roller coaster in Mie Prefecture, Japan, can be modeled by y = 10.4x, where y is the distance traveled in meters in x seconds. a. How far does the coaster travel in 25 seconds? b. The speed of Kingda Ka in Jackson, New Jersey, can be described by y = 33.9x. Which coaster travels faster? Explain your reasoning. a. y = 10.4x b. Kingda Ka; Sample answer: The Kingda Ka travels meters in 25 seconds, so it travels a greater distance in the same amount of time. Write each equation in standard form. Identify A, B, and C. A = 7, B = 5, and C = 35. Replace x with 25. A = 8, B = 3, and C = 6. The roller coaster travels 260 meters in 25 seconds. b. Kingda Ka; Sample answer: The Kingda Ka travels meters in 25 seconds, so it travels a greater distance in the same amount of time. Write each equation in standard form. Identify A, B, and C A = 7, B = 5, and C = A = 3, B = 10, and C = 5. esolutions Manual - Powered by Cognero Page 5

6 A = 3, B = 10, and C = A = 6, B = 1, and C = 0. A= 2, B = 1, and C = A = 9, B = 8, and C = A = 3, B = 1, and C = A = 5, B = 32, and C = A = 6, B = 1, and C = 0. esolutions Manual - Powered by Cognero Page 6

7 A = 5, B = 32, and C = So, the x-intercept is 6. So, the y-intercept is 18. A = 2, B = 31, and C = 78. Find the x-intercept and the y-intercept of the graph of each equation. Then graph the equation using the intercepts. 35. So, the x-intercept is 0.5. So, the y-intercept is crosses the y-axis is called the y-intercept So, the x-intercept is 7. So, the y-intercept is esolutions Manual - Powered by Cognero Page 7

8 crosses the y-axis is called the y-intercept So, the x-intercept is 7. So, the y-intercept is So, the x-intercept is. So, the y-intercept is. 38. So, the x-intercept is. So, the y-intercept is. 39. So, the x-intercept is 12. So, the y-intercept is 18. esolutions Manual - Powered by Cognero Page 8

9 So, the x-intercept is 12. So, the y-intercept is 18. So, the x-intercept is 18. So, the y-intercept is So, the x-intercept is 18. So, the y-intercept is CCSS MODELING Latonya earns a commission of \$1.75 for each magazine subscription she sells and \$1.50 for each newspaper subscription she sells. Her goal is to earn a total of \$525 in commissions in the next two weeks. a. Write an equation that is a model for the different numbers of magazine and newspaper subscriptions that can be sold to meet the goal. b. Graph the equation. Does this equation represent a function? Explain. c. If Latonya sells 100 magazine subscriptions and 200 newspaper subscriptions, will she meet her goal? Explain. a. Let m and n represent the number of magazines and newspapers respectively. Commission for m magazines = 1.75m Commission for n newspapers = 1.5n The goal is \$525. So: esolutions Manual - Powered by Cognero Page 9

10 41. CCSS MODELING Latonya earns a commission of \$1.75 for each magazine subscription she sells and \$1.50 for each newspaper subscription she sells. Her goal is to earn a total of \$525 in commissions in the next two weeks. a. Write an equation that is a model for the different numbers of magazine and newspaper subscriptions that can be sold to meet the goal. b. Graph the equation. Does this equation represent a function? Explain. c. If Latonya sells 100 magazine subscriptions and 200 newspaper subscriptions, will she meet her goal? Explain. a. Let m and n represent the number of magazines and newspapers respectively. Commission for m magazines = 1.75m Commission for n newspapers = 1.5n The goal is \$525. So: The amount that Latonya will earn is \$475. So, she could not meet her goal. 42. SNAKES Suppose the body length L in inches of a baby snake is given by L(m) = m, where m is the age of the snake in months until it becomes 12 months old. a. Find the length of an 8-month-old snake. b. Find the snake s age if the length of the snake is 25.5 inches. a. L(m) = m Replace m with 8. The length of an 8-month-old snake is 17.5 inches. b. Replace L with 25.5 inches. b. Therefore, the snake is 12 months. 43. STATE FAIR The Ohio State Fair charges \$8 for admission and \$5 for parking. After Joey pays for admission and parking, he plans to spend all of his remaining money at the ring game, which costs \$3 per game. The graph passes the vertical line test. So, the equation represents a function. c. Replace m with 100 and n with 200. a. Write an equation representing the situation. b. How much did Joey spend at the fair if he paid \$6 for food and drinks and played the ring game 4 times? a. Let x be the number of games that Joey plays. The amount spend by Joey is given by: The amount that Latonya will earn is \$475. So, she could not meet her goal. 42. SNAKES Suppose the body length L in inches of a baby snake is given by L(m) = m, where m is the age of the snake in months until it becomes 12 months old. a. Find the length of an 8-month-old snake. b. The amount that Joey spent on admission, parking, and food is \$19. The amount spent on 4 games = 3(4) = \$12. esolutions Manual - Powered by Cognero Page 10 So, the total amount = \$19 + \$12 = \$31. Write each equation in standard form. Identify

11 Therefore, the snake is 12 months. 43. STATE FAIR The Ohio State Fair charges \$8 for admission and \$5 for parking. After Joey pays for admission and parking, he plans to spend all of his remaining money at the ring game, which costs \$3 per game. a. Write an equation representing the situation. b. How much did Joey spend at the fair if he paid \$6 for food and drinks and played the ring game 4 times? a. Let x be the number of games that Joey plays. The amount spend by Joey is given by: b. The amount that Joey spent on admission, parking, and food is \$19. The amount spent on 4 games = 3(4) = \$12. So, the total amount = \$19 + \$12 = \$31. Write each equation in standard form. Identify A, B, and C A = 1, B = 6, and C = 7. A = 4, B = 40, and C = Find the x-intercept and the y-intercept of the graph of each equation. 47. A = 1, B = 6, and C = Replace y with 0. esolutions Manual - Powered by Cognero Page 11

12 2-2 Linear Relations and Functions So, the y-intercept is Find the x-intercept and the y-intercept of the graph of each equation Replace y with 0. Replace y with 0. So, the x-intercept is Replace x with 0. So, the x-intercept is 7.5. Replace x with 0. So, the y-intercept is So, the y-intercept is Replace y with 0. esolutions Manual - Powered by Cognero Page 12

13 a. Write an equation to model the situation. 2-2 Linear Relations and Functions So, the y-intercept is So, the y-intercept is. 50. FUNDRAISING The Freshman Class Student Council wanted to raise money by giving car washes. The students spent \$10 on supplies and charged \$2 per car wash. a. Write an equation to model the situation. b. Graph the equation. c. How much money did they earn after 20 car washes? Replace y with 0. d. How many car washes are needed for them to earn \$100? a. Let c be the number of cars and E be the earnings. So: E = 2c 10 b. So, the x-intercept is. Replace x with 0. c. Replace c with 20. They earned \$30 by washing 20 cars. d. Replace E with 100. So, the y-intercept is. 50. FUNDRAISING The Freshman Class Student Council wanted to raise money by giving car washes. The students spent \$10 on supplies and charged \$2 per car wash. They need to wash 55 cars to earn \$ MULTIPLE REPRESENTATIONS Consider the following linear functions. esolutions Manual - Powered by Cognero Page 13

14 f (x) = 2(x 3) 2-2 Linear Relations and Functions They need to wash 55 cars to earn \$ MULTIPLE REPRESENTATIONS Consider the following linear functions. is -15. ; the y-intercept is 5, the x-intercept a. GRAPHICAL Graph the linear functions on separate graphs. b. TABULAR Use the graphs to complete the table b. Analyze the graphs of each function to determine whether they are one-to-one or onto. c. VERBAL Are all linear functions one-to-one and/or onto? Explain your reasoning. a. Use the intercepts to graph each equation. f(x) = -2x + 4; The y-intercept is 4, the x-intercept is 2. g(x) = 6; the y-intercept is 6, there is no x-intercept. c. No; horizontal lines are neither one-to-one nor onto because only one y-value is used and it is repeated fo every x-value. Every other linear function is one-toone and onto because every x-value has one unique y value that is not used by any other x-element and every possible y-value is used. 52. CHALLENGE Write a function with an x-intercept of (a, 0) and a y-intercept of (0, b). Sample answer: Use the x- and y-intercepts to determine the slope of the function. Since the y- intercept is (0, b), the function will be in the form. Find m using the x-intercept. Let f(x) = 0 and x = a. Solve for m. The function is. is -15. ; the y-intercept is 5, the x-intercept 53. OPEN ENDED Write an equation of a line with an x-intercept of 3. Sample answer:an x-intercept of 3 means that when 3 is substituted into the equation, y = 0. To write an equation, one factor should be (x - 3). esolutions Manual - Powered by Cognero Page 14

16 The cost of n DVDs is 15n 2. The cost of 1 DVD is. 2-2 Linear Relations and Functions The correct choice is C. 58. SHORT RESPONSE What is the complete solution of the equation? The correct choice is J. 60. ACT/SAT Which function is linear? A B C D The solution set is { 3, 9}. 59. NUMBER THEORY If a, b, c, and d are consecutive odd integers and a b c d, how much greater is c + d than a + b? F 2 H 4 G 6 J 8 Let a = 2n + 1. E In a linear function, the exponent of the independent variable is less than or equal to 1, and the variable is not in the denominator of a fraction. The correct choice is E. State the domain and range of each relation. Then determine whether each relation is a function. If it is a function, determine if it is oneto-one, onto, both, or neither. So: Therefore: 61. The left side of the mapping is the domain and the right side is the range. D = { 4, 1, 8}, R = {3, 6, 9}; The correct choice is J. The relation is not a function because 4 is mapped to both 3 and ACT/SAT Which function is linear? A B C D E 62. The members of the domain are the x-values of the relation while the members of the range are the y- values. esolutions Manual - Powered by Cognero Page 16 D = { 2, 1, 2, 4}, R = {1, 3, 5};

17 D = { 4, 1, 8}, R = {3, 6, 9}; The relation is not a function because 4 is mapped 2-2 Linear to both Relations 3 and 9. and Functions 62. The members of the domain are the x-values of the relation while the members of the range are the y- values. The function is both one-to-one and onto because each element of the domain is paired with a unique element of the range and each element of the range corresponds to an element of the domain. 64. SHOPPING Claudio is shopping for a new television. The average price of the televisions he likes is \$800, and the actual prices differ from the average by up to \$350. Write and solve an absolute value inequality to determine the price range of the televisions. Let x be the actual price of the television. So: D = { 2, 1, 2, 4}, R = {1, 3, 5}; Each element of the domain is paired with exactly one element of the range. So, the relation is a function. The function is onto because each element of the range corresponds to an element of the domain. This implies: The price of the televisions ranges from \$450 to \$1150. Evaluate each expression if a = 6, b = 5, and c = The members of the domain are the x-values of the relation while the members of the range are the y- values. D = { 4, 3, 7}, R = { 2, 1, 9}; 65. Replace a with 6, b with 5, and c with 3.6. Each element of the domain is paired with exactly one element of the range. So, the relation is a function. The function is both one-to-one and onto because each element of the domain is paired with a unique element of the range and each element of the range corresponds to an element of the domain. 64. SHOPPING Claudio is shopping for a new television. The average price of the televisions he likes is \$800, and the actual prices differ from the average by up to \$350. Write and solve an absolute value inequality to determine the price range of the televisions. Let x be the actual price of the television. 66. Replace a with 6, b with 5, and c with 3.6. esolutions Manual - Powered by Cognero Page 17

18 66. The number of large pizzas with different onetopping = 3. Total = 9 Evaluate each expression. 69. Replace a with 6, b with 5, and c with Replace a with 6, b with 5, and c with FOOD Brandi can order a small, medium, or large pizza with pepperoni, mushrooms, or sausage. How many different one-topping pizzas can she order? The number of small pizzas with different onetopping = The number of medium pizzas with different onetopping = 3. The number of large pizzas with different onetopping = 3. Total = Evaluate each expression esolutions Manual - Powered by Cognero Page 18

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