# 2-4 Writing Linear Equations. Write an equation in slope-intercept form for the line described.

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1 Write an equation in slope-intercept form for the line described 1 slope 15, passes through (0, 5) m = 15 (x, y) = (0, 5) in the equation y = mx + b 3 passes through (3, 5); m = 2 m = 2 (x, y) = (3, 5) in the equation y = mx + b m = 2 b = 11 in the equation m = 15 b = 5 in the equation y = mx + b y = mx + b y = 2x passes through ( 8, 2); 2 passes through ( 2, 3) (0, 1) in the ula m = (x, y) = ( 8, 2) in the equation y = mx + b m = 1 in the point m = b = 18 in the equation y = mx + b esolutions Manual - Powered by Cognero Page 1

2 5 MULTIPLE CHOICE Which is an equation of the line? CCSS PERSEVERANCE Write an equation in slope-intercept form for the line that satisfies each set of conditions 6 passes through ( 9, 3), perpendicular to The slope of the line is The slope A of the line perpendicular to the given line is B m = in the point C D m = 4 in the point esolutions Manual - Powered by Cognero Page 2

3 7 passes through (4, 10), parallel to 9 slope passes through (0, 5) The slope of the line is The slope of the line parallel to the given line is m = y = mx + b (x, y) = (0, 5) in the equation m = in the point m = b = 5 in the equation y = mx + b 10 slope passes through (0, 8) Write an equation in slope-intercept form for the line described 8 slope 3, passes through (0, 2) m = 3 (x, y) = (0, 2) in the equation y = mx + b m = y = mx + b (x, y) = (0, 8) in the equation m = 3 b = 2 in the equation y = mx + b m = y = mx + b b = 8 in the equation esolutions Manual - Powered by Cognero Page 3

4 11 slope passes through m = (x, y) = (0, ) in the equation 13 slope 4, passes through (6, 9) m = 4 (x, y) = (6, 9) in the equation y = mx + b y = mx + b m = 4 b = 15 in the equation y = mx + b m = b = in the equation y = mx + b 14 slope passes through ( 6, 8) m = equation (x, y) = ( 6, 8) in the 12 slope 2, passes through ( 3, 14) m = 2 (x, y) = ( 3, 14) in the equation y = mx + b y = mx + b m = b = in the equation m = 2 b = 8 in the equation y = mx + b y = mx + b esolutions Manual - Powered by Cognero Page 4

5 15 slope passes through (12, 4) Write an equation of the line passing through each pair of points m = equation y = mx + b (x, y) = (12, 4) in the 17 ( 2, 6), (4, 6) in the ula m = b = 1 in the equation y = mx + b in the point- m = 2 16 PART-TIME JOB Each week, Carmen earns a base pay of \$15 plus \$017 for every pamphlet that she delivers Write an equation that can be used to find how much Carmen earns each week How much will she earn the week that she delivers 300 pamphlets? Let x be the number of pamphlets that Carmen delivers Let y be the amount Carmen earns each week The equation to find the amount that Carmen earns each week is y = 017x + 15 x = 300 in the equation y = 017x + 15 Subtract 6 from each side Thus, Carmen will earn \$66 esolutions Manual - Powered by Cognero Page 5

6 18 ( 8, 5), ( 3, 10) 19 ( 4, 12), ( 2, 4) in the point- m = 3 in the point- m = 8 Subtract 5 from each side Add 12 to each side esolutions Manual - Powered by Cognero Page 6

7 20 (46, 34), (22, 28) 21 (55, 06), (11, 28) m = 025 point- in the m = 05 point- in the esolutions Manual - Powered by Cognero Page 7

8 22 ( 25, 16), ( 29, 12) CCSS PERSEVERANCE Write an equation in slope-intercept form for the line that satisfies each set of conditions 23 passes through (4, 2), perpendicular to y = 2x + 3 The slope of the line y = 2x + 3 is 2 The slope of the line perpendicular to the given line is m = in the pointslope form m = 7 point- in the Subtract 16 from each side 24 passes through ( 6, 6), parallel to The slope of the line is The slope of the line parallel to the given line is m = in the pointslope form esolutions Manual - Powered by Cognero Page 8

9 25 passes through (12, 0), parallel to The slope of the line is The slope of the line parallel to the given line is m = in the point 27 FINANCIAL LITERACY Julio buys a used car for \$5900 Monthly expenses for the car which include insurance, maintenance, gas total \$180 per month Write an equation that represents the total cost of buying owning the car for x months Let y be the total cost of buying owning the car m = 180 b = 5900 in the equation y = mx + b 26 passes through (10, 2), perpendicular to y = 4x + 6 The slope of the line y = 4x + 6 is 4 The slope of the line perpendicular to the given line is m = in the point esolutions Manual - Powered by Cognero Page 9

10 28 DELI The sales of a swich store increased from \$52,000 to \$116,000 during the first five years of business Write an equation that models the sales y after x years Determine what the sales will be at the end of 12 years if the pattern continues The two ordered pairs which represent the year their sale are (1, 52000) (5, ) 29 WHALES In 2009, it was estimated that there were 300 northern right whales in existence The population of northern right whales is expected to decline by at least 25 whales each generation Write an equation that represents the number of right whales that will be in existence in x generations Let y be the number of right whales The slope is 25 The equation to find the number of right whales that will be in existence in x generations is y = 25x +300 m = 16,000 point in the Add 52,000 to each side x = 12 in the equation At the end of 12 years, the sale will be \$228,000 esolutions Manual - Powered by Cognero Page 10

11 Write an equation in slope-intercept form for each graph 30 The line passes through the points (0, 12) (6, 2) in the ula 31 The line passes through the points (0, 6) ( 6, 2) in the ula m = in the pointslope form m = in the point Add 6 to each side Add 12 to each side esolutions Manual - Powered by Cognero Page 11

12 33 ROSES Brad wants to send his girlfriend Kelli a dozen roses He visits two stores For what distance do the two stores charge the same amount to deliver a dozen roses? 32 The line passes through the points (3, 3) (0, 15) in the ula Let x be the number of miles Let y be the amount to deliver a dozen roses The amount charged by Full Bloom store is y = 3x + 30 The amount charged by Flowers-R-Us store is y = 2x + 40 Equate two equations Solve for x in the point- m = 4 For the distance of 10 mi the two stores will charge the same amount esolutions Manual - Powered by Cognero Page 12

13 34 TYPING The equation y = 55(23 x) can be used to model the number of words y you have left to type after x minutes a Write this equation in slope-intercept form b Identify the slope y-intercept c Find the number of words you have left to type after 20 minutes m = 5 in the point a Distribute 55 within the parenthesis Add 100 to each side b Slope of the equation is the coefficient of x, 55 y- intercept of the equation is 1265 b The y-intercept of the equation is 50 Thus, Ms Cooper s daily salary is \$50 c x = 20 in the equation c x = 20 in the equation y = x 35 RECRUITING As an army recruiter, Ms Cooper is paid a daily salary plus commission When she recruits 10 people, she earns \$100 When she recruits 14 people, she earns \$120 Ms Cooper will earn \$150 if she recruits 20 people 36 CCSS MODELING Refer to the table a Write a linear equation to model this situation b What is Ms Cooper s daily salary? c How much would Ms Cooper earn in a day if she recruits 20 people? a The two ordered pairs which represent the number of recruits the salary are (10, 100) (14, 120) a Write graph the linear equation that gives the distance y in kilometers in terms of the number x in miles b What distance in kilometers corresponds to 20 miles? c What number is the same in kilometers miles? Explain your reasoning a The two ordered pairs which represent the number of miles its distance in kilometers are (100, 161) (50, 805) esolutions Manual - Powered by Cognero Page 13

14 37 REASONING Determine whether the following statement is always, sometimes, or never true Explain your reasoning The quadrilateral formed by any two parallel lines two lines perpendicular to those lines is a square Sample answer: Sometimes; while the two sets of parallel perpendicular lines will always form a quadrilateral with four 90º angles, that figure will always be a rectangle, but not necessarily a square m = 161 point in the b x = 20 in the equation y = 161x 322 km corresponds to 20 miles c 0; because this is the point on the graph where the x-value the y-value are the same esolutions Manual - Powered by Cognero Page 14

15 38 CHALLENGE Given with vertices A(a, b), B(c a, d), C(c + a, d), D(c, b), write an equation of a line perpendicular to diagonal contains A that in the ula 39 REASONING Write y = ax + b in point- y = 0 in the equation y = ax + b m = a in the point Thus, slope of diagonal is Slope of the line perpendicular to the diagonal is m = in the point 40 OPEN ENDED Write the equations of two parallel lines with negative slopes y = 2x + 3 y = 2x 1 esolutions Manual - Powered by Cognero Page 15

16 41 REASONING Write an equation in point- of a line with an x-intercept of c y-intercept of d in the ula 43 The total cost c in dollars to go to a water park ride n water rides is given by the equation c = n If the total cost was \$33, how many water rides were ridden? A 6 B 7 C 8 in the point D 9 c = 33 in the equation c = n 42 WRITING IN MATH Why do we represent linear equations in more than one form? Sample answer: Depending on what information is given what the problem is, it might be easier to represent a linear equation in one form over another For example, if you are given the slope the y-intercept, you could represent the equation in slope-intercept form If you are given a point the slope, you could represent the equation in pointslope form If you are trying to graph an equation using the x- y-intercepts, you could represent the equation in stard form So, the correct choice is A 44 SHORT RESPONSE To raise money, the service club bought 1000 cy bars for \$060 each If the club sells all of the cy bars for \$1 each, what will be their total profit? If the club sells all of the cy bars for \$1, they will get a profit of \$400 esolutions Manual - Powered by Cognero Page 16

17 45 PROBABILITY A fair six-sided die is tossed What is the probability that a number less than 3 will show on the face of the die? F G H J The numbers less than 3 in a six-sided die are 2 1 m = 2 in the pointslope form So the correct choice is G 46 ACT/SAT What is an equation of the line through A B So, the correct choice is A C D E esolutions Manual - Powered by Cognero Page 17

18 Determine the rate of change of each graph 47 The line passes through the points (0, 4) (6, 6) in the ula 48 The line passes through the points (0, 6) (8, 0) in the ula esolutions Manual - Powered by Cognero Page 18

19 Solve each inequality 51 Add 2x 4 to each side of the inequality 49 The line passes through the points (0, 4) (10, 6) Divide each side by 4 52 Multiply both sides of the inequality by 5 Add 15x to each side 50 RECREATION Scott is currently on page 210 of an epic novel that is 980 pages long He plans to read 30 pages per day until he finishes the novel Write solve a linear relation to determine how many days it will take Scott to complete the novel Let x be the number of days Subtract 2 from each side Divide each side of the inequality by 16 The equation to determine the number of days Scott will take to complete the novel is 30x = 980 Solve the equation for x Thus, Scott will take 26 days to complete the novel esolutions Manual - Powered by Cognero Page 19

20 53 Multiply both sides of the inequality by , 48, 60 The longest side is 60, so use 60 as c, the measure of the hypotenuse Let a b be the lengths of the two shorter sides Subtract 12x 15 from each side the values of a, b c in the Pythagorean Theorem simplify Divide each side of the inequality by 13 Thus, the lengths 36, 48, 60 form a right triangle Determine if the triangles with the following lengths are right triangles 54 5, 12, 13 The longest side is 13, so use 13 as c, the measure of the hypotenuse 56 7, 23, 25 The longest side is 25, so use 25 as c, the measure of the hypotenuse Let a b be the lengths of the two shorter sides the values of a, b c in the Pythagorean Theorem simplify Let a b be the lengths of the two shorter sides the values of a, b c in the Pythagorean Theorem simplify Thus, the lengths 7, 23, 25 do not form a right triangle Thus, the lengths 5, 12, 13 form a right triangle esolutions Manual - Powered by Cognero Page 20

21 57 Multiply Use the FOIL method to multiply the two binomials Find the slope of the line that passes through each pair of points Express as a fraction in simplest form 60 (4, 8), ( 2, 6) in the ula 58 Use the FOIL method to multiply the two binomials 61 ( 6, 3), ( 2, 9) in the ula 59 Use the FOIL method to multiply the two binomials esolutions Manual - Powered by Cognero Page 21

22 62 ( 4, 1), ( 8, 8) 64 (105, 3), (18, 8) 63 (12, 4), (42, 10) in the ula 65 (35, 25), ( 1, 2) esolutions Manual - Powered by Cognero Page 22

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