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

User Idupree
by
6.3k points

2 Answers

5 votes

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

User Logovskii Dmitrii
by
5.7k points
5 votes

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

User Dave Child
by
6.2k points
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