Answers

2015-12-16T09:28:26+05:30
As we have two eqns, first is  3a - 5b = 5  --- (1) 
and second is                a/a+b = 5/7
                                      7a = 5(a + b)
                                   or 2a - 5b = 0  ----- (2)
therefore, subtracting 1 and 2 we will get a = 5 and b = 2 
 and (a-b) = (5-2) = 3 Ans.
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2015-12-16T15:57:08+05:30
3a-5b=5
2a-5b=0 by solving a/a+b=5/7
by elimination method
a=5 and b=5
a-b=5-2=3
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