Pearson Algebra 2 Common Core, 2011
PA
Pearson Algebra 2 Common Core, 2011 View details
Cumulative Standards Review

Exercise 2 Page 822

Recall the general form of an absolute value function and the roles of each constant in it.

G

Practice makes perfect
We want to find the equation of a transformed graph of an absolute value function. The parent function in this case is y=|x-1|. We are given that the graph is translated 4 units up and 3 units right. Let's first consider the general form of an absolute value function. y= a|x- h|+ k In this form, each of the constants represents one of the three basic types of transformations.
Constant Value of the Constant Transformation
a a<-1 stretch + reflection
-1 compression + reflection
0 compression
1 stretch
h h<0 translation to the left
h>0 translation to the right
k k<0 translation down
k>0 translation up

With this in mind, we can see that k and h from the general form are the values that are of interest to us. The vertical translation 4 units up will go where k goes. y=|x-1|+ 4 Now, let's consider the horizontal translation. We want to translate the graph 3 units right, so h is equal to 3. y=|x-1- 3|+4 Note that, in our case, the parent function already had a subtraction inside the absolute value. Therefore, to translate this function 3 units to the right, we need to subtract 3 from the whole expression in the absolute value symbols. Finally, let's simplify the obtained equation. y=|x-1-3|+4 ⇕ y=|x-4|+4 This corresponds to option G.