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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 0for x₁, -1 for y₁, 2 for x₂ and -4 for y₂)

                           (Simplify)

                                    (Add: )

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Next find the y-intercept.

The line crosses the y-axis at (0, – 4).

So, the y-intercept is – 4.

Replace m with and b with – 4 in the equation.

The slope-intercept form line equation is .