The green graph shows healthcare spending, in trillions of dollars, in the United States for the years 2012€“2014 and projected to 2020. The red dashed line can be used to approximate healthcare spending in the United States. If we let 0 represent 2012, 1 represent 2013, and so on, then 2020 would be represented by 8. Use the ordered pairs (0, 2.7) and (8, 4.3) to represent 2012 and 2020, respectively.

(a)  Determine the slope of the red dashed line.

(b)  Determine the equation of the red dashed line, using (0, 2.7) as the y-intercept. 

(c)  Using the equation you determined in part (b), est-mate the projected healthcare spending in the United States in 2017. $3.7 trillion

(d) Using the equation you determined in part (b), determine the year in which healthcare spending in the United States is projected to be $3.9 trillion.

Health Spending in the United States

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4.3 2.7 Year 2. 4- 3. 2. Spending ($ trillions)