SOLUTION: solve by addtion method 5x-4y=-5 x-2y=-7

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Question 34642: solve by addtion method 5x-4y=-5
x-2y=-7
Answer by checkley71(8403) About Me  (Show Source):
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5X-4Y=-5
X-2Y=-7 MULTIPLY THE SECOND EQUATION BY -2 WE GET
-2X+4Y=+14 TO WHICH WE ADD EQUATION ONE
5X-4Y=-5
--------- WE GET
3X=9 OR X=9/3 OR X=3
SUBSTITUTING 3 FOR X IN EQUATION ONE WE GET
5*3-4Y=-5 OR 15-4Y=-5 OR -4Y=-20 OR 4Y=20 OR Y=20/4 OR Y=5
PROOF 3-2*5=-7 OR 3-10=-7 OR -7=-7