Question 121744
To find the slope of the line, you first need to know two points 

(({{{x[1]}}},{{{y[1]}}}) and ({{{x[2]}}},{{{y[2]}}}) ) that the line is going through, and 

calculate the change in {{{y }}} {{{over}}} the change in {{{x}}}, or the 

{{{rise}}}{{{ over}}} the {{{run}}}. 


The change is the {{{difference}}} between the {{{two }}}{{{coordinates}}}. 

So 

if the {{{y-coordinate}}} of a point goes from {{{y[1] }}} to {{{y[2]}}}, the 

change in these numbers is {{{y[2] - y[1] }}}. 

If the {{{x-coordinate}}} changes from {{{x[1] }}} to {{{x[2]}}}, then the 

change is {{{x[2] - x[1] }}}. 


- to calculate the slope we use this formula: 


{{{m = (y[2] - y[1])/ (x[2] - x[1]) = rise / run }}} where {{{m}}} is the {{{slope}}}