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Solve the following by substitution:3x + 4y = -3
x + 4y = 1


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Mlcparra16id
We make the second equation as follows:
x + 4y = 1
x = 1 - 4y

So in the first equation:
3(1 - 4y) + 4y = -3
3 - 12y + 4y = -3
-8y = -6
y = 3/4

So:
x = 1 - 4(3/4) = 1 -3 = -2

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