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Answer to Question #7431 in Algebra for Bryan

Question #7431
system of simultaneous equations by the addition method.
x+y=1
x-y=-7

whats my solution?
Expert's answer
x+y=1
x-y=-7
Let'sadd the equations:
2x=-6
whence x=-3
from the first equation of the system we get y=1-x
whence y=1-(-3)=4

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