The Slope-Intercept Form of a Linear Equation
The slope-intercept form of a linear equation is . Move slider . See the steepness of the line change. The slope of the line is . When is negative, the direction of the line changes. When , the line is flat. Vertical lines do not have a slope. Where the line intersects the -axis is the -intercept point of the line. The -intercept is the point . Only the is used in the equation, and it is the constant term of the equation. Move slider . See the line move up or down. When is positive, the y-intercept is above the -axis. When is negative, the y-intercept is below the -axis.