Posted by sam on Saturday, November 17, 2012 at 8:48pm.
it's usually easier if yu clear fractions. So,multiply #1 by4, #2 by 8:
4y = x + 16
8x = 172 + 7y
now you can rearrange things as you wish:
-x + 4y = 16
8x - 7y = 172
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