SOLUTION: solve this matrix row reduction x+2y=7 2x+y=8

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Question 847621: solve this matrix row reduction
x+2y=7
2x+y=8
Answer by checkley79(3341) About Me  (Show Source):
You can put this solution on YOUR website!

x+2y=7 MULTIPLY BY -2 & ADD
2x+y=8
-2X-4Y=-14
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Y-4Y=8-14
-3Y=-6
Y=-6/-3
Y=2 ANS.
X+2*2=7
X+4=7
X=7-4
X=3
PROOF:
2*3+2=8
6+2=8
8=8