Question

Which function has an inverse that is a function?

A. b(x)=x^2+3
B. d(x)=-9
C. -7x
D. p(x)=lxl

Answer 1

m(x)=-7x C

Explanation:

Edge

Answer 2

C. -7x

Explanation:

Only one of the offered choices passes the horizontal line test: at most one point of intersection with any horizontal line.

__

A: a parabola opening upward, so will have two points of intersection with a general horizontal line (only one at the vertex).

B: a horizontal line, so will have an infinite number of points of intersection with a horizontal line.

D. A "V-shaped" graph that will generally have two points of intersection with a horizontal line (only one at the vertex).