how to figure slope and tan

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- Dec 18th 2012, 09:34 PM #1

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- Dec 18th 2012, 09:47 PM #2

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- Dec 19th 2012, 02:12 PM #3

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## Re: tan ?

If you are given two points $\displaystyle (x_0, y_0)$ and $\displaystyle (x_1, y_1)$, then the slope of the line through those two points is given by $\displaystyle \frac{y_1- y_0}{x_1- x_0}$. If you are given an equation, say Ax+ By= C, you can solve for y, getting $\displaystyle y= -\frac{A}{B}x- \frac{C}{B}$ and the slope is $\displaystyle -\frac{A}{B}$.

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