I need a mathmatical equation to demonstrate the projected decrease in solar pan

Question

I need a mathmatical equation to demonstrate the projected decrease in solar panel costs. Quarter 4, 2009 Cost for a Residential system was $6.91/W. Quarter 4, 2010 Cost for a Residential system was $6.06/W. Quarter 4, 2011 Cost for a Residential system was $4.28/W. Quarter 4, 2012 Cost for a Residential system was $3.74/W. Quarter 4, 2013 cost for a residential system was $3.29/W. Reported system prices declined 6%-7% per year, on average, from 1998-2013, and by 12%-15% from 2012-2013.

Please create a problem and solve. If you need more information, please say what information you need. Thank you.

Explanation / Answer

The equation for the given data comes out to be a linea one as y = -0.956x + 7.724, where y= $/W, x is the year number from start(2009)(2009=1)

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