Using implicit differentiation, I get a ridiculous slope when I plug in the 2 and 1, m=-193/134.
I get -y^3-6x^5y^2 all divided by 3y^2x+2yx^6.
Can someone point out where my mistake is? I did use the product rule for xy...so not sure where I messed up.
I suspect that there is a mistake in the question, and that it ought to ask for the slope of the tangent to the curve (y^3)x+(y^2)x^2=6 at (2,1). If x^6 is replaced by x^2 in that way, then the point does lie on the curve. You can now use implicit differentiation as in the original post, and this time it should lead to a more reasonable answer.