The line equation in slope-intercept form is ,

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

The slope of the line is  = .

The line crosses the y-axis at (0, – 3). So the y-intercept is – 3.

Substitute m = -1 and b = – 3 in slope-intercept form equation.

                          (Product of two different signs is negative)

The slope-intercept form of the line equation is .