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

Question

asked Aug 9, 2021 13.7k views

2 Answers

Logovskii Dmitrii · Answer 1 · 2021-08-10T18:11:12+0000

Answer:

x=9

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

Dave Child · Answer 2 · 2021-08-14T16:41:12+0000

Answer:

x = 9

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