SOLUTION: solve the linear system using elimination 3x-y=9 2x+y=1

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Question 413666: solve the linear system using elimination
3x-y=9
2x+y=1
Answer by checkley79(3341) About Me  (Show Source):
You can put this solution on YOUR website!
3x-y=9
2x+y=1 add
----------
5x=10
x=10/5
x=2 ans.
3*2-y=9
6-y=9
-y=9-6
-y=3
y=-3 ans.
Proof:
2*2+(-3)=1
4-3=1
1=1