Final answer:
The equation of the line of best fit is y = -2x + 19, after rounding the given regression coefficients a and b to the nearest integers.
Step-by-step explanation:
To determine the equation of the line of best fit for the given data, we use the linear regression coefficients provided. These coefficients a and b represent the slope and y-intercept of the line respectively. The calculator has given us the values a = -1.96341463 and b = 19.09756098. Rounding these values to the nearest integer gives us a slope of -2 and a y-intercept of 19. Thus, the equation of the line of best fit can be written as y = -2x + 19.