Maths-
SAT
Easy
Question
Oil and gas production in a certain area dropped from 4 million barrels in 2000 to 1.9 million barrels in 2013. Assuming that the oil and gas production decreased at a constant rate, which of the following linear functions f best models the production, in millions of barrels, t years after the year 2000?
The correct answer is:
From y – y1 = m(x -x1)
If (f, t) coordinates, the f – f1 = m(t – t1)
f is in million barrels ant t in years
f1 = initial value = 4
t1 = 0
f – 4 = m(t - 0)
f – 4 = mt
f = mt + 4
‘m’ is the slope, and its given as (f2 – f1)(t2 – t1)
= (1.9 - 4)/(2013 - 2000)
= 
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