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27-04-2017
Mathematics

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X-y=3
X+2y=-6
Solve using substitution

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antonio9990 antonio9990

27-04-2017

X-y=3=>x=3+y
X+2y=-6
=========
3+y+2y=-6
3+3y=-6
3y=-6-3
3y=-9
y=-3

X+2y=-6
X+2(-3)=-6
X-6=-6
X=0

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