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April 21, 2014

April 21, 2014

Posted by **Anonymous** on Friday, July 26, 2013 at 6:21am.

- math -
**Anonymous**, Friday, July 26, 2013 at 6:42am2x+y=2 or 8x+4y=8

7x+4y=7. Subtracting one eq from other, we get x=1. Substituting this in given eq, 2x1+y=2 or y=0.

Check:0=-2x1+2 ok,

7x1+4x0=7 ok.

- math -
**Reiny**, Friday, July 26, 2013 at 7:20amideal setup for "substitution"

1st into 2nd:

7x + 4(-2x+2) = 7

7x + 8x + 8= 7

-x = -1

x = 1

plug that back into 1st, all done

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