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October 7, 2015
Posted by **jason** on Tuesday, May 10, 2011 at 8:14pm.

3x+4Y=9

y=x-3

- Algebra -
**PsyDAG**, Wednesday, May 11, 2011 at 1:22pmy = x-3

3x + 4y = 9

Substitute x-3 for y in second equation and solve for x. Insert that value into the first equation and solve for y. Check by inserting both values into the second equation.