Question

which two functions are inverse of each other

A: f(x)=x, g(x)=-x
B: f(x)=2x, g(x)=-1/2x
C: f(x)=4x, g(x)= 1/4x
D: f(x)=-8x, g(x)=8x

Answer 1

Remember, the slopes of inverse functions are opposite reciprocals of each other

Answer 2

so its A

Answer 3

x is a reciprocal of 1/x. -x is the opposite of x. -1/x is the opposite reciprocal of x.

Answer 4

ohh so its B

Answer 5

Yep

Answer 6

f(x)=2x

y = 2x

x = 2y

y = x/2 = (1/2)x

can't be B :P