The slope of the line passing through the points [tex](x_A,y_A)[/tex] and [tex](x_B,y_B)[/tex] can be calculated using the formula
[tex]m=\dfrac{y_B-y_A}{x_B-x_A}.[/tex]
Since the graph of the line passes through the points (4,41) and (7,71.75), the slope of this line is
[tex]m=\dfrac{71.75-41}{7-4}=\dfrac{30.75}{3}=10.25.[/tex]
In this situation this means that Dante earns $10.25 per hour, because you have divided the amount of money that Dante earned during 3 hours by 3 that is the number of hours Dante worked to earn $30.75.
Answer: correct choice is B