SOLUTION: In 1870 the average ground temperature in Paris was 11.8°C. Since then it has risen at a nearly constant rate, reaching 13.5°C in 1969. (a) Express the temperature T (in °C)

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Question 1145972: In 1870 the average ground temperature in Paris was 11.8°C. Since then it has risen at a nearly constant rate, reaching 13.5°C in 1969.
(a) Express the temperature T (in °C) in terms of time t (in years), where t = 0 corresponds to the year 1870 and 0 ≤ t ≤ 99. (Give your answer in slope-intercept form.)
(b) During what year was the average ground temperature 12.7°C?
Answer by josgarithmetic(39617) About Me  (Show Source):
You can put this solution on YOUR website!
Two points (t,T)
(0,11.8) & (99,13.5)

First point shows the T axis intercept.
T=%28%2813.5-11.8%29%2F%2899-0%29%29t%2B11.8

T=%281.7%2F99%29t%2B11.8


For part (b), solve for t and substitute for T=12.7.
Now add t found to 1870.