A+2b=5, 5a+b=7

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1 Answer

a=5-2b can be substituted into the second equation: 5(5-2b)+b=7, 25-10b+b=7, 18=9b, so b=2 and a=5-2*2=1.

CHECK: 1+4=5 OK, 5+2=7 OK.

by Top Rated User (1.1m points)

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