PSAT Math Multiple-Choice Practice Question 742
Question: 742
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?
Correct Answer: A
Explanation:
(A) Multiply both the slope and the y-intercept of the given line by -1 to get the reflection of the line. For y = 4x + 7, this is the equation y = -4x -7.
The general rule to find the reflection of a function f(x) across the x-axis is that the reflection is -f(x).
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