Biologists have observed that the chirping rate of crickets of a certain species is related to temperature, and the relationship appears to be very nearly linear. a cricket produces 120 chirps per minute at 70°f and 168 chirps per minute at 80°f.
(a) find the linear equation that relates the temperature t and the number of chirps per minute n.

(b) if the crickets are chirping at 138 chirps per minute, estimate the temperature. (round your answer to the nearest degree.)