# Session 3 Solving Linear and Quadratic Equations and Absolute Value Equations

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1 Session 3 Solving Linear and Quadratic Equations and Absolute Value Equations 1

2 Solving Equations An equation is a statement expressing the equality of two mathematical expressions. It may have numeric and variable terms on the left hand side (LHS) and similar terms on the right hand side (RHS): LHS = RHS 3x +2=27x 4 We want to solve the equation, which means we want to get the variable by itself on the left side and the numeric values by themselves on the right side, if possible. 2

3 Solving Equations Solving an equation means finding the value(s) the variable can take on to make the equation a true statement. Sometimes there are no such values: x = x +1 Sometimes there are multiple solutions: x 2 =4 This equation has two solutions: 2 and -2. 3

4 Solving Linear Equations To solve linear equations, we can use the additive and multiplicative properties of equality. The additive property of equality: If a = b, then a + c = b + c. If we choose c to be the additive inverse of a term, we can add or subtract it from both sides of the equation, and take steps to isolate the variable term. 3+x = x = 5 3 x = 2 4

5 Solving Linear Equations The multiplicative property of equality: If a = b, then ac = bc If we choose c to be the multiplicative inverse of a term, we can multiply both sides of the equation by the multiplicative inverse and get rid of or divide out a coefficient on the variable we are trying to isolate. ( 5 3 ( ) 3 x 5 ) = 10 x = )( 3 5 x = 50 3 ( )

6 Steps in Solving Linear Equations 1. Remove all parentheses by using the distributive property. 2. Use the additive property of equality to move all variable terms to the LHS and all constant terms to the RHS. 3. Simplify by combining like terms. 4. Use the multiplicative property of equality to change the coefficient of the variable to Simplify the RHS. When the variable is alone on the LHS, the RHS is the solution to the equation. 6. Check your answer by plugging the solution back into the original equation. (Always!) 6

7 Example: Solving Linear Equations 3(x 2) + 3 = 2(6 x) 3x = 12 2x Distributive property 3x 3 = 12 2x Combine like terms 3x +2x 3 = 12 2x +2x Add 2x to each side 5x 3 = 12 Combine like terms 5x = Add 3 to each side ( 1 5 5x = 15 Combine like terms ) ( 5x = 1 ) 5 15 Multiply each side by 1 5 x = 3 This is the solution 3(3-2) + 3 = 2(6-3)? Check your answer Yes! 7

8 Finding Linear Equations If you know two points, (x 1,y 1 ) (the x and y coordinates of the first point) and (x 2,y 2 ) (the x and y coordinates of the second point, you can find the equation for a line: 1. The slope is the change in y divided by the change in x: m = y 2 y 1 x 2 x 1 = y x 2. Set up a formula in the standard form, using the slope you calculated y = mx + b 3. Substitute x and y values for one of the points and solve for b 4. Check your answer using the x and y values for the other point (Always!) 8

9 Example: Find the Equation for a Line Suppose you have two points (-1,0) and (2,6) and you want to find the equation for the line through those two points

10 Example: Find the Equation for a Line 1. The slope is the change in y divided by the change in x: m = y 2 y 1 x 2 x 1 = ( 1) = 6 3 =2 2. Set up a formula in the standard form, using the slope you calculated y =2x + b 10

11 Example: Find the Equation for a Line 3. Substitute the x and y values for one of the points (2,6) and solve for b 6 = 2(2) + b 6=4+b 6 4=b b =2 y =2x Check your answer using the x and y values for the other point 0=2( 1) + 2? Yes! 11

12 Example: Find the Equation for a Line y =2x

13 Another Way to Find the Equation for a Line We have been using the slope-intercept form of the equation for a line. Another way to find the equation for a line is to use the point-slope method. m =slope (x 1,y 1 ) = one point on the line y y 1 = m(x x 1 ) So, given slope = 2 and point (x 1,y 1 )=( 1, 0): Same as before! y 0=2(x ( 1)) y =2x +2 13

14 Solving Quadratic Equations You may need to find the solution to a quadratic equation. To do this, you must use the distributive, additive, and multiplicative properties to get the equation into this form: ax 2 + bx + c =0 Then you can plug a, b, andc into the following equation, which is called the quadratic formula. x = b ± b 2 4ac 2a b2 4ac is called the discriminant. 14

15 Solving Quadratic Equations The solution to a quadratic equation specifies where it crosses the x axis. A quadratic equation may have 2 solutions: A quadratic equation may have no solutions:

17 Solving Quadratic Equations: Example 3(x 2 +2x)+2 = x 2 6x 4 3x 2 +6x +2 = x 2 6x 4 4x 2 +6x +2 = 6x 4 4x 2 +6x +6 = 6x 4x 2 +12x +6 = 0 So a =4,b =12andc =6. 17

18 Solving Quadratic Equations: Example a =4,b=12,c=6 x = b ± b 2 4ac 2a x = 12 ± (4)(6) (2)(4) x = 12 ± 48 8 x = ± 8 x = = x = = The two solutions are and

19 Solving Quadratic Equations: Example Check the solutions: 4x 2 +12x +6 = 0 4( 0.634) ( 0.634) + 6 = = 0 4( 2.366) ( 2.366) + 6 = = 0 Good! 19

20 Solving Quadratic Equations: Example We can graph quadratic equations in a manner similar to that for linear functions: y =4x 2 +12x +6 x y

22 Solving Quadratic Equations: Example Recall the 8 animals who received different doses of a drug and whose weight gain was measured. The quadratic equation that best described the relationship between dose and weight gain was: y = x +0.17x 2 We can use substitution to find the predicted weight gain, given a dose. For example, if we know an animal like these received dose 3, we would predict that the weight gain would be (3) (3)(3) = 1.43 dekagrams. What if we knew the animal had gained 5 dekagrams, and wanted to deduce what the dose had been? 22

23 Solving Quadratic Equations: Example Hint: Before getting tangled up in arithmetic, think about what a reasonable solution might be. Recall: Dose Weight Gain (dekagrams) If the animal gained 5 dekagrams, the dose was probably between 6 and 7. 23

24 Solving Quadratic Equations: Example Hint: When possible, draw a picture Wt Gain Dose 24

25 Solving Quadratic Equations: Example If the animal had gained 5 dekagrams, substituting for y, y =5 = x +0.17x = x +0.17x 2 0 = 0.17x x 3.87 We can use the quadratic equation with a =0.17, b = 0.41, c =

26 Solving Quadratic Equations: Example x = 0.41 ± ( 0.41) 2 ((4)(0.17)( 3.87)) (2)(0.17) x = 0.41 ± x = 0.41 ± x = ± x = ± x = or We should go back and check these! 26

27 Solving Quadratic Equations: Example The solutions to the equation are and Do both of these make sense in the context of our problem? No - animals cannot receive a negative dose! We are only interested in solutions greater than zero. The predicted dose is (We can envision a dose bigger than 6, but less than 7.) This agrees with our best estimate before doing the math. 27

28 Absolute Value Equations Recall: Absolute value refers to a number s distance from 0 on the real number line =5 2 =2 0 =0 a b is the absolute value of (a b), or the distance from a to b Example: 5 3 =2 28

29 Absolute Value Equations a + b can be thought of as a ( b), or the distance between a and b. 5+3 = 5 ( 3), or the distance betwen 5 and -3, or 8. a b = a (+b), or the distance from a to b 5 3 = 5 (+3) = 8 =8 29

30 Solving Absolute Value Equations a = 5 means, What values of a are 5 units away from 0? Solutions: 5 and -5 a 3 = 2 means, What are the values of a such that the distance between a and 3 is 2? We can deduce the answer by finding 3 on the number line and finding the values 2 units away from 3. Algebraically, we can solve the equations a 3=2anda 3= 2. So a = 5 and a =1 30

31 Solving Absolute Value Equations Solve 5 3x +5 =3 Subtract x +5 =3 5 Simplify Mult. by -1 3x +5 = 2 ( 1)( 3x +5 ) =( 1)( 2) Simplify 3x +5 =2 Solve separately 3x +5=2 3x +5= 2 Subtract 5 3x +5 5=2 5 3x +5 5= 2 5 Simplify 3x = 3 3x = 7 Mult. by 1 3 (3x)( 1 3 )=( 3)( 1 3 ) (3x) 1 3 =( 7) 1 3 Solutions x = 1 x =

32 Solving Absolute Value Equations Highly recommended: Check your solutions by plugging them back into the original equation: 5 3( 1) ? = 3? = 3 Yes! 5 3( 7 3 )+5? = Yes!? = 5 2=3? = 3? = 5 2=3 32

33 Solving Absolute Value Equations Note that simplifying absolute values should come early in the order of operations, similar to brackets and parentheses. 3x +5 = 2 is not the same as 3x +5=2 33

34 Example: Using Absolute Values in Statistics You are studying the relationship between head injury and helmet use among people involved in bicycle accidents (Pagano and Gauvreau, page 311). You have information for 793 people involved in accidents. Of those, 147 people were wearing helmets and 235 people experienced a head injury. You can make a table that illustrates what you know, and add what you would expect to see if there were no association between helmet use and head injury: Wearing Helmet Yes No Total Head Yes 235 Injury No Total

35 Example: Using Absolute Values in Statistics Here is the table of expected values we just created: Wearing Helmet Yes No Total Head Yes Injury No Total When you add the information you have about helmet use among people who experienced a head injury, here is what you observed: Wearing Helmet Yes No Total Head Yes Injury No Total

36 Example: Using Absolute Values in Statistics We can use a test statistic to see whether the difference between observed and expected values is big enough to signify that wearing helmets is associated with fewer head injuries. Here s what the test statistic looks like: χ 2 = 4 i=1 ( O i E i 0.5) 2 E i 4 means add the first through the 4th of what comes next i=1 O i is the observed value for position i, where i is either 1, 2, 3, or 4 E i is the expected value in the corresponding position χ 2 (Chi-squared) is the name of this particular test statistic 36

37 Example: Using Absolute Values in Statistics 4 χ 2 ( O i E i 0.5) 2 = i=1 E i χ 2 = ( )2 ( ) ( ) 2 ( ) = = What does this mean? Is there an association between helmet use and head injury? Stay tuned! 37

38 Inequalities An inequality is like an equation, but it says that two expressions are not equal. a b a is not equal to b a<b ais less than b a b a>b ais greater than b b a a b a b a is greater than or equal to b a is less than or equal to b Note that less than means to the left on the number line and greater than means to the right on the number line. 38

39 Example: Using Inequalities The value of the test statistic, χ 2, that we obtained in the last example was We can look this up in a table and see how statistically significant this is. The smaller the p-value, the more statistically significant p-value χ 2 As we can see from the table, the p-value gets smaller as the χ 2 values get bigger. Since > 10.83, p < We conclude that wearing helmets is associated with lower rates of head injury. 39

40 Solving Linear Inequalities As with equalities, we can use the additive and multiplicative properties of inequality. One wrinkle: If you multiply both sides of an inequality by a negative number, the direction of the inequality changes. So multiplying or dividing both sides of an equation by a negative number means you should reverse the inequality. Example: 4 < 7 (4)( 1)? < (7)( 1) multiply by -1 4? < 7 Not true! 4 > 7 reverse direction of inequality 40

41 Solving Linear Inequalities: Example Solve: x +3> 4x +6 add -4x to both sides x 4x +3> 4x 4x +6 combine like terms 3x + 3 > 6 add -3 to both sides 3x +3 3 > 6 3 multiply by 1 3 ( 3x)( 1 3 & change direction of 3x >3 ) < (3)( 1 3 ) inequality x< 1 Check: Does x = 2 work? Does x = 3 work? 41

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