SOLUTION: If 2x+y=8 and x-y=1,then y=

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Question 639888: If 2x+y=8 and x-y=1,then y=
Answer by nerdybill(7384) About Me  (Show Source):
You can put this solution on YOUR website!
If 2x+y=8 and x-y=1,then y=
.
2x+y=8 (equation 1)
x-y=1 (equation 2)
.
Solve equation 2 for x:
x-y=1
x=y+1
.
Substitute above into equation 1 and solve for y:
2x+y=8
2(y+1)+y=8
2y+2+y=8
3y+2=8
3y=6
y = 2