Ifmis the slope of the curve and m2 is the slope of the curve , then at a point of intersection of the two curves:

- (A) m1 = m2
- (B) m1= -m2
- (C) m1*m2 = 1
- (D) m1*m2 = -1
- (E) m1*m2 = -2

I think I might be doing it wrong... >_<

First, I found the derivative of the first one explicitly.

which is:

And then, the derivative of the second one implicitly:

which is:

But I can't see a relationship between the two slopes...?