# Math Help - Finding dy

1. ## Finding dy

Let y = ln(5x-2)
a) Find dy
b) Estimate dy for x = 2 and dx = .003.

Confused as to what to do, could anyone help?

2. Originally Posted by Murphie
Let y = ln(5x-2)
a) Find dy
b) Estimate dy for x = 2 and dx = .003.

Confused as to what to do, could anyone help?
$dy=y'\,dx$

3. Originally Posted by Murphie
Let y = ln(5x-2)
a) Find dy
b) Estimate dy for x = 2 and dx = .003.

Confused as to what to do, could anyone help?
$\frac{dy}{dx} = \frac{d}{dx} log(5x-2) = \frac{1}{5x-2}$

Therefore,

$dy = \frac{dx}{5x-2}$

now calculate!