Question

The graph models the height of a burning candle over a 10-hour period.

What is the rate of change of the candles height?

Answer 1

D. -1.5 cm/hour

Explanation:

Rate of change =
`(y_2 - y_1)/(x_2 - x_1)`

Using the coordinates of the two points on the line, (0, 18) and (4, 12),

Let,

`(0, 18) = (x_1, y_1)`

`(4, 12) = (x_2, y_2)`

Plug the values into the formula for rate of change.

Rate of change =
`(12 - 18)/(4 - 0)`

`= (-6)/(4)`

Simplify

`= (-3)/(2) = -1.5`

Rate of change = -1.5 cm/hour