Question

7. Given 3x - y = 15, find y when x = -4
A. 27
B. 3
C. -3
D. -27
8. Given 3x - y = 15, find y when x = -2
A. -21
B. -9
C. 9
D. 21
9. Given 3x - y = 15, find y when x = 2
A. -21
B. -9
C. 9
D. 21
10. Given 3x - y = 15, find y when x = 4
A. -27
B. -3
C. 3
D. 27

Answer 1

Plug in the given value and solve.
I'll do the first one.

Given 3x - y = 15, find y when x = -4
3(-4) - y = 15
-12 - y = 15
Add 12.
-y = 27
Divide by -1.
y = -27

Try the rest and tell me what you get.