Solve the system using elimination. x + 2y = –6 3x + 8y = –20

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01-08-2017
Mathematics

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Solve the system using elimination. x + 2y = –6 3x + 8y = –20

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texaschic101 texaschic101 · Answer 1 · 2017-08-01T16:36:43+02:00

texaschic101 texaschic101

01-08-2017

x + 2y = -6....multiply by -3
3x + 8y = -20
---------------
-3x - 6y = 18 (result of multiplying by -3)
3x + 8y = -20
--------------add
2y = -2
y = -2/2
y = -1 <===

x + 2y = -6
x + 2(-1) = -6
x - 2 = -6
x = -6 + 2
x = -4 <==

solution is (-4,-1)

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