The value of dy/dt is -52/x².
The process of finding the derivative of a dependent variable in an implicit function by differentiating each term separately, by expressing the derivative of the dependent variable as a symbol, and by solving the resulting expression for the symbol.
From the given expression, the value of dy/dx is calculated as follows;
xy = 4
y = 4/x
y = 4x⁻¹
dy/dx = -4x⁻² = -4/x²
dx/dt = 13
dy/dt = dy/dx . dx/dt
dy/dt = -4/x²(13) = -52/x²
Thus, the value of dy/dt is -52/x².
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