y= -x
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It depends on how y depends on x.
xy = x ÷x y = 1
y is directly proportional to x. When y = 15, x = 3 therefore y = 5x When x = 12, then y = 5 x 12 = 60.
If x+y = 3 and y times x = 2 then y = 1.
y = 3x y = 3*19 = 57