SOLUTION: Find the solution to the system of equations given below by using linear combination: 8x + 4y = 48 4x – 2y = 40 A. (8, -4) B.(11, 2) C.(-8, 24) D. (8, 4)

Algebra ->  Coordinate Systems and Linear Equations  -> Lessons -> SOLUTION: Find the solution to the system of equations given below by using linear combination: 8x + 4y = 48 4x – 2y = 40 A. (8, -4) B.(11, 2) C.(-8, 24) D. (8, 4)       Log On


   

Question 746857: Find the solution to the system of equations given below by using linear combination:
8x + 4y = 48
4x – 2y = 40
A. (8, -4)
B.(11, 2)
C.(-8, 24)
D. (8, 4)
Answer by checkley79(3341) About Me  (Show Source):
You can put this solution on YOUR website!
8x + 4y = 48
4x – 2y = 40 MULTIPLY BY 2 & ADD
8X-4Y=80
8X+4Y=48
------------------
16X=128
X=128/16
X=8 ANS.
8*8+4Y=48
64+4Y=48
4Y=48-64
4Y=-16
Y=-4 ANS.
PROOF:
4*8-2*-4=40
32+8=40
40=40
ANSWER A(8,-4)