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What is the solution for 3x plus y equals 4 and x plus y equals 0?
Wiki User
∙ 11y ago
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)
Wiki User
∙ 11y ago
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