SOLUTION: Solve system by elimination y-7=x x+y=13

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Question 109690: Solve system by elimination
y-7=x
x+y=13
Answer by solver91311(24713) About Me  (Show Source):
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Start by putting your equations into standard form: ax%2Bby=c
:
-x%2By=7
x%2By=13
:
You can eliminate the x term in this case by simply adding the two equations, term by term:
:
0x%2B2y=20
2y=20
y=10
:
You can solve for x by either substitution now that you know the value of y, or you can go back to your original equation set and SUBTRACT the two equations, term by term:
:
-2x%2B0y=-6
x=3
: