Final answer:
The y-intercepts for line Y2 and Y3 are -206.3 and -140.7 respectively, which are calculated by setting x to zero in the given line equations.
Step-by-step explanation:
The y-intercept of a line is the value of y when x is zero. This can be calculated from the line's equation by setting x to zero and solving for y. Let's analyze the given equations Y2 = -173.5 + 4.83x − 2(16.4) and Y3 = -173.5 + 4.83x + 2(16.4), where the y-intercept is seen when x=0. To find the y-intercept for line Y2, we calculate -173.5 − 2(16.4) which simplifies to -206.3. Similarly, for Y3, the y-intercept is -173.5 + 2(16.4) = -140.7. Therefore, the y-intercepts for Y2 and Y3 are -206.3 and -140.7 respectively.