You did not post the equation, but we can use this one in order to have an illustration.
y= 3×2; y=x3+7
3×2 means the x squared
x3+7 means x cubic plus seven.
To find the correct answer, we have to follow the differential equations formulae solve the equation, and simplify the solution.
Differentiating y from x using the respective differential equation formulae
y(x)=x3 + 7
simplify the equation above in order to get the value of (x)y