Jeremiah M.

asked • 02/28/15

solving by substitution

2X-y=-1
X=y+2

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David W. answered • 02/28/15

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When you have 2 equations with 2 variables, you can use one of them to help solve the other. In this case, we know x=y+2, so you can substitute y+2 for x in the first equation.
 
2(y+2) - y = -1
2y + 4 - y = -1
 
Solve for y, then plug that value in to either equation and solve for x.
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Jeremiah M.

I got that part but im stuck on 2y +4-y=-1
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02/28/15

David W.

Subtract 4 from both sides to get:
2y - y = -5
y = -5
 
Then put -5 in for y in the second equation to find x.
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02/28/15

Jeremiah M.

Thanks 
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02/28/15

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