Asked by Aaron

8. Write an equation for a trend line and predict the value when x is 15.

x 0 3 6 9 12
y 17.5 35.4 50,5 60.6 66.3
Answered by John
Pick any two points

(0, 17.5) and (3, 35.4)

Find the slope (35.4-17.5)/(3-0)

17.9/3=5.96666 or 5.97

y = mx+b
17.5 = b since x=0

y = 5.97x + 17.5

replace x with 15 and find y.
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