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OpenStudy (anonymous):
x - y = 13 2x + y = 2
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OpenStudy (pfenn1):
Rearrange the first equation so you get x in terms of y. Plug that expression for x into the second equation and solve it for y.
OpenStudy (radar):
Add the two equations eliminating y solve for x. then substitute for x in the first equation and solve for y.
OpenStudy (radar):
When you add, you will get 3x=15.
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