PCAT Quantitative Reasoning – Inverse Function Graph
 by
 Oct 25, 2017
 PCAT Question of the Day
Explanation
A is correct. The curve shown on the graph appears to be a polynomial function. In fact, it has a similar shape to the graph of y = x^{2} except that the curve has been translate up about 5 units. Therefore, the most likely equation is y = x^{2} + 5, which we can confirm by plugging in various points from the graph:
We arenâ€™t quite finished yet because the question asks for the inverse of this function. To find the inverse, we swap the x and y values in the function equation and isolate y:
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