Digital PSAT Math Practice Question 200: Answer and Explanation

Question: 200

If the line given by the equation y = 4x + 7 is reflected about the x axis, what will be the graph of the resulting function?

• A.
• B.
• C.
• D.

Correct Answer: A

Explanation:

(A) Take both the slope and the y-intercept and multiply them by - 1 to get the reflection of the line. For y = 4x + 7 this will be the equation y = -4x - 7

The general rule for a reflection of a function f (x) across the x axis is that the reflection is -f (x).