SOLUTION: Solve the system of equations 3x + y =1 -x + 2y = 9

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Question 344129: Solve the system of equations
3x + y =1
-x + 2y = 9
Answer by Fombitz(32388) About Me  (Show Source):
You can put this solution on YOUR website!
Solve the system of equations
1.3x+%2B+y+=1
2.-x+%2B+2y+=+9
Multiply eq. 2 by 3 and add to eq. 1,
3x%2By-3x%2B6y=1%2B27
7y=28
highlight%28y=4%29
.
.
.
From eq. 2,
-x%2B8=9
-x=1
highlight%28x=-1%29