Biologists have observed that the chirping rate of crickets of a certain species is related to temperature, and the relationship appears to be nearly linear. A cricket produces 120 chirps per minute at 70 degrees F and 168 chirps per minute at 80 degrees F.
A. Find a linear equation that models the temperature T when crickets are chirping at x chirps per minute.
B. If the crickets are chirping at 150 chirps per minute, estimate the temperature.
C. Find the y-intercept of the line. What does it represent?