Differentiation - Stuck :(

Can anyone help me out here please:

The equations ux = v^2 + y and vy = x^2 + 2u^2 define u and v as
functions of the independent variables x and y. Show that:

(du/dx) = (uy-4xv) / (8uv-xy)

and

(dv/dx) = (4u^2-2x^2) / (8uv-xy)

Where the differentials are partial.

Just can't see how to apply the following to help me:

(dz/du) = (dz/dx)(dx/du)+(dz/dy)(dy/du)

(dz/dv) = (dz/dx)(dx/dv)+(dz/dy)(dy/dv)

Again, all differentials are partial.

Thanks for any help,
Mitch.

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