Which function has an inverse that is a function?
b(x) = x2 + 3
d(x) = –9
m(x) = –7x
p(x) = |x|

C

Step-by-step explanation:

If a function passes both the vertical line test (so that it is a function) and the horizontal line test (so that its inverse is a function), then the function is one-to-onefunction and has an inverse function.

A.

The graph of this function is a parabola. Each vertical line crosses it at exactly one point, but horizontal lines can cross it at two points.

B.

This is not a function, because h=the vertical line y=-9 crosses it at infinitely many points.

C.

Both vertical and horizontal lines cross the graph of this function at exactly one point. So, this function has an inverse

D.

Each vertical line crosses it at exactly one point, but horizontal lines can cross it at two points.

just needed some points but try socratic