Posted by **Help101** on Sunday, June 17, 2012 at 9:02pm.

I need help with this problem: finding the instantaneous rate of change of y with respect to x at the point x=5 if y=x^2/2+3/5x-1

I know I am suppose to find the determinant first then plug in 5...but I am not sure about the determinant

- math -
**Reiny**, Sunday, June 17, 2012 at 9:16pm
You meant "derivative" instead of "determinant"

The determinant has nothing to do with this.

dy/dx = x + 3/5

when x = 5

dy/dx = 5 + 3/5 = 28/5 or 5.6

- math -
**Help101**, Sunday, June 17, 2012 at 9:23pm
wait, what happened to the -1?

- math -
**Help101**, Sunday, June 17, 2012 at 9:23pm
or the 2 in the x^2/2?

- math -
**Help101**, Sunday, June 17, 2012 at 9:25pm
...wait, duh, i figured out the x^2/2

- math -
**Reiny**, Sunday, June 17, 2012 at 9:47pm
I assumed you knew how to find the derivative of such a simple expression.

Remember the derivative of a constant is zero ,

if you want I could write it as

dy/dx = x +3/4 + 0

- math -
**Help101**, Sunday, June 17, 2012 at 11:54pm
ohh okay, i forgot about that! thank u so much for helping me :)

## Answer This Question

## Related Questions

- Derivatives Instantaneous rate of change - The electric field E at a distance r ...
- calculus - What is the instantaneous slope of y =8/x at x = -3? What is the ...
- instantaneous rate of change problem - Joe is investigating the rate of change ...
- math - Let f be defined as follows. y=f(x)=x^2-12x (a) Find the average rate of ...
- math - Let f be defined as follows. y = f(x) = x^2 - 4 x (a) Find the average ...
- URGENT, Calculus! - A science project studying catapults sent a projectile into ...
- CALC SHOULD BE EASYISH - Let f be defined as follows. F(x)=y=x^2 -7 (a) Find the...
- calculus - Let f be defined as follows. F(x)=y=x^2 -7 (a) Find the average rate ...
- Chem - I just need to know if I did the problem correctly. The decomposition of...
- Math - The cost in dollars of producing x units of a particular camera is C(x...

More Related Questions