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... Express you answer as y^-9 =

I assume I need to set up a differential equation, but I do not even know where to begin.

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Solve the differential equation $\frac{dy}{dx}=\frac{y^{10}}{x^3}$ with initial condition $y(1)=1$. The variables can be separated, so solving the DE should not be difficult.

Why? Because the differential equation above says exactly that the slope of the tangent line at $(x,y)$, which is $\dfrac{dy}{dx}$, is equal to the expression on the right.

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    You need to evaluate $C$ using the initial condition.2012-10-04