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December 21, 2014

December 21, 2014

Posted by **ann** on Thursday, July 26, 2007 at 6:41am.

Should i solve by using substitution, elimination or multiply then use elimination?

Try adding them. Add up the left sides and the right sides (after rearranging the second equation) the x term will drop out, giving you

4x -2y = 2

-4x-y = 7

-3y = 9

y = -3

For x, substitute y=-3 into the first equation

x = (1/4)(2 +2y) = -1

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