Answer: 13.7636
The value is approximate. Round it however you need to.
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Explanation:
x = number of years
y = cost
The teacher wants to know what value of x will make y = 2500.
Plug it in and solve for x.
y = 134.02x + 655.40
2500 = 134.02x + 655.40
2500-655.40 = 134.02x
1844.6 = 134.02x
x = 1844.6/134.02
x = 13.7636 approximately
Somewhere between year 13 and 14 is when the price should be $2500. This is of course based on the regression line estimate which isn't perfect.
