# Equation of a Line (Refresher)ΒΆ

All line equations in this text will be presented in the form *y = mx + b*,
where *m* is the slope and *b* is the y-intercept. This is also called
slope-intercept form. The **y-intercept** is the y-value at the point where the
line crosses the y-axis. The slope gives the steepness
of the line, and can be positive, negative, or zero. Slope-intercept form is a
method to better understand the relationship between the two variables *x* and *y*.

This figure depicts an equation of a line that has a y-intercept of 5 and a negative slope.

The equation of the line in the above figure has a y-intercept of 1 and a positive slope.

For additional review on slope-intercept form you can also watch out this video.

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