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Solve the following systems by substitution:
x = y + 1
x + 2y = 7

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Mlcparra16viz
We express x in terms of y using the first equation in the second:
[tex]x+2y=7 \\ y+1+2y=7 \\ 3y=6 \\ y=2[/tex]

We use the first equation:
[tex]x=y+1=2+1=3[/tex]