Posted by Rachel on Saturday, February 25, 2012 at 9:36pm.
8a+5s=12220
a+s=1970
Solve by elimination (of s)
Multiply the second equation by 5 and subtract from the first:
8a-5a + 5s-5s = 12220-5*1970
3a = 2370
a=790
Solve for s using a=790
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