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March 3, 2015

Posted by **katie** on Wednesday, November 10, 2010 at 2:12pm.

9p+6q=78 ?

- algebra -
**Jen**, Wednesday, November 10, 2010 at 2:17pm4p+3q=36 (1)

9p+6q=78 (2)

You want to eliminate either the p's or q's to solve for one. Eliminating the q's is easier because you only have to change one equation. Multiplying (1) by -2...

-8p-6q=-72 (3)

9p+6q=78 (2)

Add the equations together.

p=6

Now substitute p=6 in either equation 1 or 2 to figure out what q equals.

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