if 8x-7y=11&7x-8y=4,the value of x-y is
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8x-7y=11 eqn 1
7x-8y=4 eqn 2
Adding both the eqn,
15x-15y=15
Multiplying throughout by 15,
x-y=1
7x-8y=4 eqn 2
Adding both the eqn,
15x-15y=15
Multiplying throughout by 15,
x-y=1
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