Based on the equation given, the value of x and y will be 8 and -4 respectively.
From the information given,
3x - y = 4 ..... i
x - y = 4 ..... ii
From equation ii x = 4 + y
Put the value of x into equation i
3x - y = 4
3(4 + y) - y = 4
12 + 3y - y = 4
3y - y = 4 - 12
2y = -8
y = -8/2 = -4
Since x - y = 4
x - 4 = 4
x = 4 + 4 = 8
x = 8
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