Originally Posted by

**Jhevon** the derivative gives the formula formula for the slope at any value of x. plug in the required x-value into your derivative equation and that will give you the slope at that point. this will be the m in the equation of your line, y = mx + b

once you have m, you can use the point-slope form:

$\displaystyle y - y_1 = m(x - x_1)$

where $\displaystyle (x_1,y_1)$ is a point the line passes through, this is given to you. just solve for $\displaystyle y$ and you have your line