In the accompanying figures, the numbers on the axes have been lost. All you know is that

Question:

In the accompanying figures, the numbers on the axes have been lost. All you know is that the units shown on the vertical axis are the same as the units on the horizontal axis.

a. In panel (a), what is the slope of the line? Show that the slope is constant along the line.
b. In panel (b), what is the slope of the line? Show that the slope is constant along the line.