Answer:
Catherine is not correct (see the explanation)
Step-by-step explanation:
The picture of the question in the attached figure
we know that
The formula to calculate the slope between two points is equal to
[tex]m=\frac{y2-y1}{x2-x1}[/tex]
the two points from the graph are
(4,40) and (7,70)
substitute the values in the formula
[tex]m=\frac{70-40}{7-4}\\m=\frac{30}{3}\\m=10[/tex]
therefore
Catherine is not correct
