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3x + y = 4

x + y = 0

solve for y

y = -3x +4

y = -x

substitute y = -x into y = -3x +4, so the result is: -x = -3x +4

solve for x

-1x = -3x +4

+3x +3x

2x = 4

--------

2

x = 2

then plug the x-value into one of the bolded equations and solve for y.

I chose

y = -x

y = -(2)

y = -2

so the final answer is the ordered pair (2, -2)

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โˆ™ 2012-05-16 16:11:28
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Q: What is the solution for 3x plus y equals 4 and x plus y equals 0?
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