SOLUTION: Solve the system by addition: 5x-4y=-5 x-2y=-7

Algebra ->  Coordinate Systems and Linear Equations  -> Linear Equations and Systems Word Problems -> SOLUTION: Solve the system by addition: 5x-4y=-5 x-2y=-7      Log On


   

Question 70127: Solve the system by addition:
5x-4y=-5
x-2y=-7
Answer by checkley75(3666) About Me  (Show Source):
You can put this solution on YOUR website!
5X-4Y=-5 NOW MULTIPLY THE SECOND EQUATION BY -5 & ADD
-5X+10Y=35
--------------------------
6Y=30
Y=30/6
Y=5 ANSWER NOW SUBSTITUTE 5 FOR Y & SOLVE FOR X
5X-4*5=-5
5X-20=-5
5X=-5+20
5X=15
X=15/5
X=3 ANSWER.
PROOF
5*3-4*5=-5
15-20=-5
-5=-5