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Equation 1 
We can take the value of x to be 3 and the value of y to be 1.
Thus, the solution will be as follows;
x + 7y = 10
3 + (7)(1) = 10
3 + 7 = 10
10 = 10
L.H.S = R.H.S
Equation 2 
We can take the value of x to be 1 and the value of y to be -2.
Thus, the solution will be as follows;
3x – 2y = 7
(3)(1) – (2)(-2) = 7
3 – (-4) = 7
3 + 4 = 7
7 = 7
L.H.S = R.H.S
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