26-02-2015
Mathematics

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how to solve 2x+y=2 and x+y=-1

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26-02-2015

so
2x+y=2
x+y=-1

multiply secion equation by -1
-x-y=1

add to first equation

2x-x+y-y=2+1
x=3
subsitute
3+y=-1
subtract 3
y=-4

x=3
y=-4

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