Thread: implicit differentiation

I'm having trouble with this problem. I keep thinking I'm doing it right, but when I plug it in I'm wrong. Someone please help.

2. x^2-3xy-2y^3=-148

I need to find the slope of the tangent line to the curve at (2,4)

Whelp, due date passed, thanks.

Originally Posted by nobodygirl

I'm having trouble with this problem. I keep thinking I'm doing it right, but when I plug it in I'm wrong. Someone please help.

2. x^2-3xy-2y^3=-148

I need to find the slope of the tangent line to the curve at (2,4)

Whelp, due date passed, thanks.

Differentiating with respect to x we have:





So collecting the terms with the derivative and rearranging gives:



or:



RonL