Y-intercept = -20.
In the slope-intercept form, y = mx + b:
m = slope of the equation. The slope compares the vertical change (the rise) to the horizontal change (the run) when moving from one fixed point to another along the line.
b = y-intercept. The y-intercept is the y-coordinate of the point where the graph of the linear equation crosses the y-axis. The y-intercept is also the value of y when x = 0.
In your given equation, the slope (m) is 4, and the y-intercept is -20.
Therefore, the correct answer is: y-intercept = -20 (the y-coordinate of the ordered pair, (0, -20)).