<PRE><B>Question 974048</B>
Average cost of a new car has been changing approximately linearly with time. 
In 1990, the average cost was $16,950, and the average cost was $27,957 in 2008. 
Let X= number of years after 1990 and let Y= average cost of a new car. 

A) What ordered pairs can be written to express this information? and B) write equation of the line through these points in point slope form. 
Set up ordered pairs as (0, 16790) (18, 27957).
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slope = (27957-16790)/(18) = 620.39
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Note that the y-intercept is 16790.
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Equation:
Y = 620.39X + 16790
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Cheers,
Stan H.
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