please help me

The following system of equations defines x=x(u,v) and y = y(u,v) as differentiable functions of u and v around the point P=(x,y,u,v) = (1,4,1, -1). y^2+2u^2+v^2-xy=15 2y^2+u^2+v^2+xy=38 1. Use Cramer's rule to find ox/ou and oy/ou at P. 2. Use Cramer's rule to find ox/ov and oy/ov at P. 3. Compute the approximate values of x and y that correspond to u= 0.9 and v=