The slope of the graph is –1. Which statement describes how the slope is related to the burning of a candle?

Question

candle height increases 1 cm per hour
candle height decreases 9 cm per hour
candle is 1 cm tall
candle burns down 1 cm per hour

Answer 1

The statement that describes how the slope of -1 relates to the burning of a candle is:

"candle burns down 1 cm per hour."

A negative slope indicates a decrease in the value, so a slope of -1 means that for every hour that passes, the height of the candle decreases by 1 cm.