Question

Find the value of x.
f(x)= (1/3)x + 5
Has the output value of -15

Answer 1

Answer: -60 = x

Explanation:

If the output value is -15, we need to do this equation.

-15 = (1/3)x + 5.

-5 -5

-20 = (1/3)x

x3 x 3

-60 = x.

Now, let's double-check our answer.

f(60) = (1/3)(-60) + 5

f(-60) = -20 + 5

f(-60) = -15.

This means that x = -60 is our correct answer.

Answer 2

-60

Explanation:

-15 = 1/3x + 5 Multiply all the way through by 3

-45 = x + 15 Subtract 15 from both sides of the equation

-60 = x