Thread: Limits/Derivatives (have to go to class soon)

1. Limits/Derivatives (have to go to class soon)

I tried this several times but couldn't get it right. I do not want answers to this. I just need help on how to set it up.

The point P(1,1/2) lies on the curve y = x/(1+x).
[A] If Q is the point (x, x/(1+x)), find the slope of the secant line PQ with the following vaules of x:
1) .5 2).9 3).99 4).999
I just don't know how to set the equation up. Please help as soon as possible. Thank you

2. Originally Posted by FalconPUNCH!
I tried this several times but couldn't get it right. I do not want answers to this. I just need help on how to set it up.

I just don't know how to set the equation up. Please help as soon as possible. Thank you
Well, you are simply trying to find the slope between the two points, so
$\displaystyle \text{slope} = \frac{\frac{x}{1 + x} - \frac{1}{2}}{x - 1}$

Now just plug in your x values.

-Dan

3. Originally Posted by topsquark
Well, you are simply trying to find the slope between the two points, so
$\displaystyle \text{slope} = \frac{\frac{x}{1 + x} - \frac{1}{2}}{x - 1}$

Now just plug in your x values.

-Dan
I did that but when I looked in the back to check if my answers were correct they differed from what I got when i plugged in the values into that equation.

Edit: I see what I did wrong. thank you a lot.