SOLUTION: If its 40 degrees and 10 chirps are per minute and its 48 degrees and 20 chirps are per minute then predict the temperature when 30 chirps are per minute?

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Question 1098638: If its 40 degrees and 10 chirps are per minute and its 48 degrees and 20 chirps are per minute then predict the temperature when 30 chirps are per minute?
Answer by josgarithmetic(39616) About Me  (Show Source):
You can put this solution on YOUR website!
Points (40,10), (48,20), and (x,30).

Assuming linear relationship,
m=%2820-10%29%2F%2848-40%29=10%2F8=5%2F4
-
highlight_green%28y-10=%285%2F4%29%28x-40%29%29
%284%2F5%29%28y-10%29=x-40
%284%2F5%29%28y-10%29%2B40=x
x=%284%2F5%29%2830-10%29%2B40
x=%284%2F5%29%2A20%2B40
x=16%2B40
highlight%28x=56%29---------temperature when 30 chirps per min.