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December 19, 2014

December 19, 2014

Posted by **Sam** on Tuesday, October 12, 2010 at 7:56pm.

3x+5y=21

x=51-9y

- substitution -
**naomi**, Tuesday, October 12, 2010 at 8:13pmsubstitute x in the eq 3x+5y=21

3(51-9y)+5y=21

153-27y+5y=21

153-22y=21

-22y=21-153

-22y=-132

-22y/-22=-153/-22

y=6

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