John has a 6 cm long rose candle. He lights the candle at 7 pm. After two hours it was 3 cm long. Find the slope of the line.

Question

John has a 6 cm long rose candle. He lights the candle
at 7 pm. After two hours it was 3 cm long. Find the slope
of the line.

Answer 1

You are going to need two points (x, y). 

 

Let x = number of hours after candle is lit since 7pm

Let y = length of candle (in cm)

 

First point = (0, 6)

Second point = (2, 3)

 

Find the slope between the two points.  The slope will tell you how much the candle decreases in length per hour.