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

Algebra ->  Graphs -> SOLUTION: Solve the system by addition. 5x – 4y = –5 x – 2y = –7       Log On


   

Question 126108:
Solve the system by addition.
5x – 4y = –5 x – 2y = –7

Answer by checkley71(8403) About Me  (Show Source):
You can put this solution on YOUR website!
FIRST WE MULTIPLY THE SECOND EQUATION BY (-2) & ADD.
-2X+4Y=14
5X-4Y=-5
-------------------
3X=9
X=9/3
X=3 ANSWER.
5*3-4Y=-5
15-4Y=-5
-4Y=-5-15
-4Y=-20
Y=-20/-4
Y=5 ANSWER.
PROOF:
3-2*5=-7
3-10=-7
-7=-7