How Do You Find The Slope Of A Line ?

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   To calculate the  slope of a line you need only two points from that line, (x1, y1) and (x2, y2). The equation used to calculate the  slope from two points is: On a graph, this can be represented as: There are three steps in calculating the  slope of a straight line when you are not given its equation.

   
   

    

   
   

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continuing irmjj's answer

If two pooints on the line are      $$(x_1,y_1)\;\;and\;\;(x_2,y_2)$$

$$slope=\frac{rise}{run}=\frac{y_2-y_1}{x_2-x_1}$$