PCAT Quantitative Reasoning – Inverse Function Graph
 by
 Apr 19, 2018
 PCAT Question of the Day
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A is correct. The first task is to find the equation for the function shown. Recall that the equation for a line in slopeintercept form is y = mx + b, where m is the slope and b is the y value of the yintercept. Let’s identify two points on the line, such as (0, –2) and (8, 0), to determine the slope:
We can also see that the line intersects the yaxis at (0, –2), so b = –2. Therefore, the equation for the line shown must be: y = 1/4 x – 2. To determine the inverse function, let’s swap x and y and then solve for x:
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