Final answer:
The y-intercept of the equation y = -3x - 6 is -6, as it is the constant term in the equation which is of the form y = mx + b.
Step-by-step explanation:
The y-intercept of the line given by the equation y = -3x - 6 is the y-value where the line crosses the y-axis. This occurs when the x-value is zero. The equation is in slope-intercept form, which is y = mx + b, where m represents the slope, and b represents the y-intercept. Therefore, for the equation y = -3x - 6, the y-intercept is -6.