0
x - 7y = 18 ... (A)
2x - 7y = 22 ... (B)
Equation (B) - equation (A) gives
x = 4
Substituting this value of x in equation (A) gives
4 - 7y = 18
or 7y = -14 which gives y = -2
Solution: (x, y) = (4, -2)
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