1. ## calc question

point moves along a curve y=2x^2+1 in such a way that the y value is decreasing at the rate of 2 units per sec. at what rate is x changing when x=3/2. I am lost on this b/c i take the 2nd deriv. (4) - am I heading in the right direction?

2. Originally Posted by weezie23
point moves along a curve y=2x^2+1 in such a way that the y value is decreasing at the rate of 2 units per sec. at what rate is x changing when x=3/2. I am lost on this b/c i take the 2nd deriv. (4) - am I heading in the right direction?
You are heading in the wrong direction, think about the fact that change in y is representative of $dy$, and $dx$ of change in x

3. ## Tangent line problem

change in y/change in x = F(c+dx) -f(c)/dx=m