Question

The trend line estimates that the price was $432 in November 2007 and $80 in September 2011. (That is an interval of 46 months.) Find the formula for the price, in dollars, as a linear function of the time t in months since November 2007.

Answer 1

Step-by-step explanation:

Okay, we do not need the image because in 46 months the decrease in y (the price) is $432-$ 80 = $352 (the increase in x)

Therefore the slope would be -$352/46 months = -$7.65 / month,

so that the price change for six months is six times that or 6(-7.65)= -$45.90