Final answer:
The y-intercept is the point where the line intersects the y-axis. It represents the value of y when x is zero.
Step-by-step explanation:
The y-intercept, a, of the line describes where the plot line crosses the y-axis. The y-intercept of the best-fit line tells us the best value of the relationship when x is zero.
The y-intercept, b, in the equation y = mx + b, is the point where the line intersects the y-axis. It tells us the initial value of y when x is zero.
In the given graph, the y-intercept is represented by the point where the line intersects the y-axis. To find the y-intercept, we look for the value of y when x = 0.