SOLUTION: Solve the system by substitution. 4x - 4y = -16 y = 5x - 8

Algebra ->  Coordinate Systems and Linear Equations -> SOLUTION: Solve the system by substitution. 4x - 4y = -16 y = 5x - 8      Log On


   

Question 164702: Solve the system by substitution.
4x - 4y = -16
y = 5x - 8
Answer by checkley77(12844) About Me  (Show Source):
You can put this solution on YOUR website!
4x - 4y = -16
y = 5x - 8
4X-4(5X-8)=-16
4X-20X+32=-16
-16X=-16-32
-16X=-48
X=-48/-16
X=3 ANSWER.
Y=5*3-8
Y=15-8
Y=7 ANSWER.
PROOF:
4*3-4*7=-16
12-28=-16
-16=-16