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If you mean: y = 4x-2 and y = x+13 then x = 5 and y = 18
4xy + x3y + yx2 + yx + 3yx = x3y + x2y + 8xy = (xy)(x2y + x + 8)
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It is not possible to answer the question because there is no equation - only an expression.
The two variables are in inverse proportion and, graphically, will form a hyperbola.