The unit rate is the rate of change per day or the slope.
To get the slope of the line, we use the slope formula:
Where is point 1 on the line and tex](x_{2},y_{2})[/tex] is point 2 on the line.
Let's take 2 points from the line and calculate the slope. We will take the points (0,0) and (1,3) (any two points on the line will give the correct answer).
<u>This means Barton reads 3 chapters per day. Answer choice C is right.</u>
ANSWER: C