Find an equation of the line containing the given pair of points

(-1,-8) and (-4,-7)







Slope - Intercept Form of the equation will help us to find the equation

given two points. 



              y = mx + b





STep 1. Find the slope given two points.

                       - 

       Slope or m =  ______________

                       - 



(-1, 8) = (, )

(-4, -7) = (, )



         -7 - 8

  m =  ___________

         -4 -(-1)



        - 15

 m =  ________

          -3



  m = 5





Step 3 : Find the y - intercept or b



       y = mx + b  where m = 5, x= -4, y = -7



Note : you can use either of the two points given. same slope of course



      -7 = 5(-4) + b

      -7 = -20 + b

  20 - 7 = b

      13 = b



Step 3: Substitute m = 5, b = 13 to slope -intercept form y = mx + b



           y = 5x + 13  ---> this is the equation in slope -intercept form



          5x - y = 13  ----> Equation in standard form.

       

 

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