Question

F(x)= x-7 when x= -2

Answer 1

Step 1: Substitute -2 in for x in the equation.
** Remember the f(x) is y, not x

f(x) = -2 - 7

Step 2: Solve the math problem that you are left with.
f(x) = -9
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f(x) = -9 is your final.

Answer 2

f(x) = x - 7
x = -2

f(-2) = -2 - 7
f(-2) = -9