Question

The height (in centimeters) of a candle is a linear function of the amount of time (in hours) it has been burning. When graphed, the function gives a line with a slope of-0.6.

Suppose that the height of the candle after 15 hours is 13 centimeters. What was the height of the candle after 11 hours

Answer 1

y = -0.6 t + b

13 = -0.6 * 15 + b
13 = - 9 + b
b = 22 cm, height at t = 0
if t = 11
y = -0.6 * 11 + 22 = 22- 6.6 = 15.4