SOLUTION: x+y=3 x-y=13 answer:(8,-5) need a full break down of how my text book come up with those solutions

Algebra ->  Systems-of-equations -> SOLUTION: x+y=3 x-y=13 answer:(8,-5) need a full break down of how my text book come up with those solutions       Log On


   

Question 186412: x+y=3
x-y=13

answer:(8,-5)
need a full break down of how my text book come up with those solutions
Answer by stanbon(75887) About Me  (Show Source):
You can put this solution on YOUR website!
x+y=3
x-y=13
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Add the two equations to get rid of the y-terms:
2x = 16
x = 8
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Substitute that into x+y =3
to solve for "Y":
8 + y = 3
y = -5
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Cheers,
Stan H.