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Suppose the height in centimeters of a candle is a linear function of the amount of time in hours it has been burning. After 5 hours of burning, a candle has a height of 24.5 centimeters. After 18 hours of burning, its height is 23.2 centimeters. What is the height of the candle after 14 hours?

Answer :

The height of the candle after 14 hours given the linear function of the amount of time in hours it has been burning is 23.6 centimeters.

How to solve linear function?

Let

  • y = height
  • x = time

Height is a linear function of time

Y = mx + b

where,

  • m = slope
  • b = y-intercept.

We can calculate the slope from the given values

(5, 24.5) and (18, 23.2)

Slope = (y2 - y1) / (x2 - x1)

= (23.2 - 24.5) / (18 - 5)

= -1.3 / 13

= -0.1

y = mx + b

24.5 = -0.1(5) + b

24.5 = -0.5 + b

24.5 + 0.5 = b

25 = b

y = mx + b

23.2 = -0.1(18) + b

23.2 = -1.8 + b

23.2 + 1.8 = b

25 = b

So therefore,

The height of a candle after 14 hours can be calculated by substituting all the unknown values.

y = mx + b

y = -0.1(14) + 25

y = -1.4 + 25

y = 23.6 centimeters

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