Final answer:
The y-intercept of a line is where the line crosses the y-axis, and for the equation -173.5 + 4.83x, it is -173.5.
Step-by-step explanation:
The question is about determining the y-intercept of a line on a scatter plot. The y-intercept is the value where the line crosses the y-axis, which corresponds to the scenario when x is zero. To find the y-intercept from an equation of the line in the form y = mx + b, looking at the constant term provides the y-intercept directly. For the equation -173.5 + 4.83x, the y-intercept is -173.5. It is essential to pay attention to the fact that the y-intercept represents the value of y when x is zero, which may or may not make sense in the context of all scenarios.