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4x-y = 9
3x -5= y
4x -(3x-5) = 9
3x-5 = 9
4x-3x +5 = 9
3x - 5=y
x=4
12-5 = y
x = 4
y = 7
2.
6x-5y=7
x-y=3
6x - 5y = 7
x = 3+y
6(3+y) -5y = 7
x=3+y
18 +6y -5y = 7
x= 3+y
y= -11
x = -8