Question

Malena is in a book club. The graph shows a proportional relationship between the number of the books Malena has read and the number of the years she has been in the club.

Answer 1

Given:

There are given the graph to find the slope:

Explanation:

To find the slope, we need to select two intersecting points.

So,

The two points are:

$(2,30),(4,60)$

Now,

From the formula to find the slope:

$m=\frac{y_2-y_1}{x_2-x_1}$

Then,

$\begin{gathered} m=\frac{y_{2}-y_{1}}{x_{2}-x_{1}} \\ m=\frac{60-30}{4-2} \\ m=\frac{30}{2} \\ m=15 \end{gathered}$

So,

The slope of the given line is 15.

Final answer:

Hence, the correct option is D.