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x = 3 +y
2x +3y = 16
2(3+y) + 3y = 16
6+2y +3y = 16
5y = 10
y=2
x= 5
2.
y = 10-5x
4x -2y = -6
4x - 2(10-5x) =-6
4x -20 +10x = -6
14x = 14
x= 1
y = 10-5x = 10-5=5