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

First find the slope of the line.

                                (Substitute )

                                (Apply additive identity property: )

                                      (Subtract: )

                                        (Divide: )

Next find the y-intercept.

The line crosses the y-axis at (0, 1).

So, the y-intercept is 1.

Replace m with 3 and b with 1 in the equation.

The slope-intercept form line equation is .