if possible , solve the system below by the method of substitution .

x + y = 1

2x - y = 2

x = y -1

2(y-1) - y = 2

2y - 2 - y = 2

y -2 = 2

y = 2 + 2

y =4

x + 4 = 1

x = 1-4 = -3

x = -3 y =4

Thanks.

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