Final answer:
The rate of change is represented by the slope of a line, while the y-intercept represents the value of the dependent variable when the independent variable is zero. To find the rate of change using the y-intercept and a highlighted dot, you would need the coordinates of the highlighted dot.
Step-by-step explanation:
The rate of change is represented by the slope of a line. The y-intercept is the value of the dependent variable (y) when the independent variable (x) is zero. In this case, the y-intercept is given as 'a'. The slope is represented by 'b' in the equation ŷ = a + bx. The slope tells us how the dependent variable changes for every one-unit increase in the independent variable. To find the rate of change using the y-intercept and a highlighted dot, you would need the coordinates of the highlighted dot.