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Solve the following systems by substitution: x = y + 4
x + y = 6

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Mlcparra16viz
We substitute the value of x to the second equation:
x + y = 6
y + 4 + y = 6
2y + 4 = 6
2y = 2
y = 1

We substitute this to the first equation:
x = 1 + 4 = 5

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