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25-01-2017
Mathematics

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-7x - 2y = -13
× - 2y = 11

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freshpixel freshpixel

25-01-2017

From second: x = 11+2y, now replace it in the first one:
-7(11+2y)-2y=-13
-77-14y-2y=-13
-16y=-13+77
-16y=64
y=64/(-13)
y=-4.92

x-2*(-4.92) = 11
x+9.84=11
x=11-9.84
x=1.16

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