First of hello all.

This problem has me a little stumped, however I could just be over-thinking it like I usually do.

Here it is:

"Find the equation of the one line (there are two) tangent to the curve y^2 - xy + x^2 = 7 when x=1."

I found the derivative to be :

dy/dx = (y-2x)/(2y-x)

And From here I'm not quite sure where to go.

Can someone point me in the right Direction?

Thanks a billion

-Zapz