SOLUTION: using the elimination method help me solve x-y=10, and -x-y=20 for x and y

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Question 776967: using the elimination method help me solve x-y=10, and -x-y=20 for x and y

Found 2 solutions by stanbon, solver91311:
Answer by stanbon(75887) (Show Source):
You can put this solution on YOUR website!
using the elimination method help me solve x-y=10, and -x-y=20 for x and y
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x-y=10
-x-y=20
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Add to get:::
-2y = 30
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Divide both sides by -2 to get:
y = -15
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Solve for "x":::
x - y = 10
x --15 = 10
x +15 = 10
x = -5
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Cheers,
Stan H.
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Answer by solver91311(24713) (Show Source):
You can put this solution on YOUR website!

The coefficients on are 1 and -1, which are additive inverses. So if you just add the two equations, term by term, the variable will be eliminated, leaving you with a single variable linear equation in . Solve for . Then, after you have a value for , substitute that value into either of the original equations. Solve for

John

Egw to Beta kai to Sigma
My calculator said it, I believe it, that settles it