SOLUTION: solve by substitution: 2x-y=5 x+4y=7

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Question 360163: solve by substitution:
2x-y=5
x+4y=7
Answer by checkley77(12844) About Me  (Show Source):
You can put this solution on YOUR website!
2x-y=5
x+4y=7 OR x=7-4y
2(7-4y)-y=5
14-8y-y=5
-9y=5-14
-9y=-9
y=-9/-9
y=1 ans.
x=7-4*1
x=7-4
x=3 ans.
Proof:
2*3-1=5
6-1=5
5=5