1. Find the inverse function of f informally.

f (x) =-3

f-1 exponent (x) = 3x+1

Verify that f(f-1exponent (x) ) = x and f -1 exponent (f(x) ) =x.

f (f-1exponent (x) ) =f( Answer )

+ ( Answer) - 3

=x

f -1exponent (f(x) ) =f-1exponent ( Answer)

=( Answer) +3

=x

2.Find a direct variation model that relates y and x.

x=7,y=16

Answer =

3.Determine whether the variation model represented by the ordered pairs (x,y) is of the form y=k/x.

(5, -0.5), (10,-1), (15, -1.5), (20,-2), (25,-2.5).

Select the write one

a. The model is of the form y=kx.

b. The model is of the form y = k/x.

Find k.

k = Answer

Write model that relates y and x.

Answer