The line equation in slope-intercept form is ,

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

Calculate the slope,

m = 

    =                  (Substitute )

    =                        (Product of two same signs is positive)

    =                                 (Apply additive inverse property: )

    =                                  (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.

                               (Zero product property: )

The slope-intercept form of the line equation is .