Nikki1112 Nikki1112

06-12-2016
Mathematics

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Solve: 3x-3y=3
y=-5x-17

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blahboy1429 blahboy1429

06-12-2016

Substitute y = -5x - 17 into the first equation:
-3x - 3y = 3
-3x - 3*(-5x - 17) = 3

-3x + 15x + 51 = 3
-3x + 15x = 3 - 51
12x = -48
x =-48/12 = -4

y = -5x - 17 = -5*(-4) - 17 = 20 - 17 = 3

so the solution is x = -4, y = 3

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