SOLUTION: Solve each system by the substitution method: x+3y=2 -x+y=1

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Question 169485: Solve each system by the substitution method:
x+3y=2
-x+y=1
Answer by checkley77(12844) About Me  (Show Source):
You can put this solution on YOUR website!
x+3y=2 or x=2-3y
-x+y=1
-(2-3y)+y=1
-2+3y+y=1
4y=1+2
4y=2
y=2/4
y=1/2 ans.
x+3*1/2=2
x+3/2=2
x=2-3/2
x=-1/2 ans.
Proof:
-(-1/2+1/2=1
1/2+1/2=1
1=1 ans.