The line equation in slope-intercept form is ,

where m is the slope and b is the y-intercept.

Calculate the slope,

m = 

    =                                (Substitute )

    =                                      (Multiply:)

    =                                                (Add:)

    =                                                  (Divide:)­­

The line crosses the y-axis at (0, -4). So the y-intercept is -4.

Substitute m = 0 and b = -4 in slope-intercept form line equation.

                                           (Multiply:)

The slope-intercept form of the line equation is .