Question

The Snowtree cricket behaves in a rather interesting way: The rate at which it chirps depends linearly on the temperature. One summer evening you hear a cricket chirping at a rate of 160 chirps/minute, and you notice that the temperature is 80°F. Later in the evening, the cricket has slowed to 120 chirps/minute, and you notice that the temperature has dropped to 70°F. Express the temperature T as a linear function of the cricket's rate of chirping r.

Answer 1

treat it as two ordered pairs of the type (t,c)
given: (80,160) and (70, 120)

slope = (160-120)/(80-70) = 40/10 = 4
so
chirps = 4xtime + b
using (80,160)
160 = 4(80) + b
b = -160

chirps = 4(time) - 160
or
4(time) = chirps + 160
time = (1/4)chirps + 40

testing: if chirps = 120
time = (1/4)(120) + 40
= 30 + 40 = 70 , as given

Answer 2

Hello Philo !Je ne sais pas d'où viennent mes cercles à pâtisserie : mon frère me les a offerts pour mes 30 ans.En revanche, je sais où tu peux en trouver : chez Dehillerin, à Paris, pas très loin de Chttnele¢.SinoÃ, j'imagine que sur meilleurduchef il doivent en vendre.A bientôt !