# What is the slope of a line that with the points (0, -1) (-1, 1)?

Jan 19, 2016

m = - 2

#### Explanation:

To find the slope of a line joining 2 points use the gradient formula.

$m = \frac{{y}_{2} - {y}_{1}}{{x}_{2} - {x}_{1}}$

where $\left({x}_{1} , {y}_{1}\right) = \left(0 , - 1\right) , \left({x}_{2} , {y}_{2}\right) = \left(- 1 , 1\right)$

( substitute values into formula )

$m = \frac{1 - \left(- 1\right)}{- 1 - 0} = \frac{2}{-} 1 = - 2$