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Posted by **crystine** on Sunday, September 11, 2011 at 2:28pm.

3x+y=-1

2x+3y=18

using substitution

- Algebra 2 -
**Ms. Sue**, Sunday, September 11, 2011 at 2:37pm3x+y=-1

y = -1 -3x

2x+3y=18

2x + 3(-1-3x) = 18

2x - 3 - 9x = 18

-7x = 21

x = -3

Substitute -3 for x in the first problem to find the value of y.

- Algebra 2 -
**sukhi**, Wednesday, September 14, 2011 at 9:10pmmatrix[2x,0

4,-y]=matrix[4,0

4,1]

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