Help with this math please

The answer is -20 .

Step-by-step explanation:

You have to substitute x = -4 into the function :

Step-by-step explanation:

f(x) = 3x - 8

f(-4) = 3*(-4) - 8

f(-4)  = -12 - 8

f(-4) = - 20

-20 is what goes in the box.

y=−9/2x+10

step-by-step explanation:

let's solve for y.

0−9x−2y=−20

step 1: add 9x to both sides.

−9x−2y+9x=−20+9x

−2y=9x−20

step 2: divide both sides by -2.

−2y

−2

=

9x−20

−2

y=

−9

2

x+10