Question

The following graph shows the relation between the length of the timber and the price. The unit rate is dollars per metre.

• A. 2
• B. 3
• C. 4

Answer 1

The correct option is A 2

Unit rate is the slope of the line.

To find the slope, take one point in the graph.

Let the point be(2,4)

Slope = $\frac{y}{x}$

= $\frac{4}{2}$

= 2

Hence, the unit rate is 2 dollars per metre.