Question

F(x) = 10x - 15. What value of x makes f(x) = 75?

Answer 1

Answer:

x=9

Step-by-step explanation:

Set the function equal to 75 and solve for x.

75=10x-15

add 15 to each side

90=10x

divide each side by 10 to isolate x

9=x or x=9

Answer 2

Answer:

x = 9

Step-by-step explanation:

f(x) = 10x - 15

f(x) = 75

Plug in 75 for f(x)

75 = 10x - 15

add 15 from either side

90 = 10x

divide either side by 10

9 = x