10-02-2017
Mathematics

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I need help solving systems of equations by substitution

I need help solving systems of equations by substitution class=

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10-02-2017

-7x-2y=-13
x= 2y+11 make x or why the subject and substitute it into the first equation.
-7(2y+11)-2y=-13
-14y-77-2y=-13
-16y=64
y=-4
x=-2×-4+11
x=3

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