tan ?

• December 18th 2012, 10:34 PM
marlene
tan ?
how to figure slope and tan(Thinking)
• December 18th 2012, 10:47 PM
Soroban
Re: tan ?
Hello, marlene!

What are we given?
• December 19th 2012, 03:12 PM
HallsofIvy
Re: tan ?
If you are given two points $(x_0, y_0)$ and $(x_1, y_1)$, then the slope of the line through those two points is given by $\frac{y_1- y_0}{x_1- x_0}$. If you are given an equation, say Ax+ By= C, you can solve for y, getting $y= -\frac{A}{B}x- \frac{C}{B}$ and the slope is $-\frac{A}{B}$.

Those formulas are given in any Calculus text aren't they?