How is the slope-intercept form of a line expressed?

The slope-intercept form of a line is expressed as ( y = mx + b ). In this equation, ( m ) represents the slope of the line, which indicates the steepness and direction of the line (whether it rises or falls as you move from left to right on the graph). The term ( b ) represents the y-intercept, which is the point where the line crosses the y-axis. This form is particularly useful because it allows for quick identification of both the slope and the y-intercept directly from the equation, facilitating graphing and understanding the line's behavior.

The other options provided represent different forms or equations that are not in slope-intercept form, such as quadratic equations or different relationships between the variables. This reinforces that ( y = mx + b ) specifically captures the linear relationship that defines the slope and intercept of a line.