The equation y=14.7x+16.9 estimates the amount that businesses will spend, in billions of dollars, on a certain business technology, where x is the number of years after 2002. For what years will the spending be more than $61 billion?
Set y = 61 and find x
61 = 14.7x + 16.9
x = (61 - 16.9)/14.7
x = 3
So spending will be more than $61 billion in all years after (2002 + 3), I.e. from 2006 onwards.
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