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7x-5y=31
4x-7y=-3
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7x-5y=31 (1)
4x-7y=-3 (2)
Multiply eq. (1) by 4 and eq. (2) by 7 we get,28x-20y=124 (3)
28x-49y=-21 (4)
Subtract the eq. (3) and eq.(4) we get
29y=145
y=145/29
y=5
By putting the value of y in eq.(1) we will get the value of x
7x-5y=31 (1)
7x-5(5)=31
7x-25=31
7x=31+25
7x=56
x=56/7
x=8
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