We have two parallel lines on the graph, and we know that parallel lines have the same slope.
If we know that the slope of the red line is m = 2/5, then the slope of the green line is the same too:
[tex]m_1=m_2\rightarrow\text{ If the lines are parallel.}[/tex]
Therefore, in summary, since the green line is parallel to the red line, and the slope of the red line is m = 2/5, then the slope of the green line is m = 2/5 (Option A.)
