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December 20, 2014

December 20, 2014

Posted by **jerson** on Tuesday, April 6, 2010 at 2:55pm.

0.08x+0.02y=310 Solve the system using the method of addition?=.

ok this is how my book says solve it

[2] x - y=100 -----> 2x-2y=2000

[-25] 0.08x+0.02y=310 -->-2x-0.5y=-7750

where and how did they get [-25]?

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