Question

A function follows the rule y = -75 - 5x. When the function's output is 25, the equation is 25 = -75 - 5x.

What is the function input when the output is 25?

(A) 20
(B) -20
(C) 10
(D) -10

Answer 1

-20

Explanation:

Answer 2

-20

Explanation:

The first thing you want to do is inverse operation (In this scenario you have negative 75 but change it to positive 75 and add that +75 to +25)

25=-75-5x

+75 +75

__________

100 = -5x

Now divide 100 by negative 5

100 = -5x

________

-5 -5

Which you should get -20

-20 = x