Observe the graph; the line is passing through origin (0, 0) and (2.5, 2).

The line equation in slope-intercept form is , where m is the slope and b is the y-intercept.

 First find the slope (m).

Slope formulae is

               (Replace  with 0, 0, 2.5 and 2)

               (Subtract: )

                    (Subtract: )

                      (Find the value using a calculator: )

Next find the y-intercept (b).

                (Substitute for m)

             (Substitute 0, 0 for x and y)

                          (Multiply: )

 Substitute 0.8 for m and 0 for b in the Slope-intercept form equation

 The line equation in slope-intercept form is .