Question

Barton reads part of a book every night before he goes to bed. The graph shows the number of chapters that he reads over time.

Answer 1

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:

$m=\frac{y_{2}-y_{1}}{x_{2}-x_{1}}$

Where $(x_{1},y_{1})$ 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).

$m=\frac{3-0}{1-0} \\m=\frac{3}{1}\\m=3$

This means Barton reads 3 chapters per day. Answer choice C is right.

ANSWER: C