If 13x + 7y = 27 and 7x + 13y = 15 , then x - y =___________(Options are 1, -1, 2, -2)
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13x+7y = 27 -------(1)
7x+13y = 15 --------(2)
Substracting (2) from (1) we get
(13x+7y)-(7x+13y) = 27-15
=> 6x-6y = 12
=> 6(x-y) = 12
=> x-y = 2
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