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 140 chirps per minute, and you notice that the temperature is 80°F. Later in the evening, the cricket has slowed down to 120 chirps per minute, and you notice that the temperature has dropped to 75°F. What is the temperature if the cricket is chirping at a rate of 108 chirps per minute?
?
A. 72°F
B. 70°F
C. 78°F
D. 67°F
E. 76°F
Answer: A
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A. y = 7x - 19
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C. y = - 
x - 
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= 
A. 
B. 
C. 
D. 
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