Final answer:
Graphs depicting an object moving with a constant negative velocity show a negative slope on a position vs. time graph and a horizontal line below the time axis on a velocity vs. time graph, with the shaded area representing displacement.
Step-by-step explanation:
When drawing graphs of motion for an object with a constant negative velocity, the position vs. time graph will show a straight line with a negative slope. This indicates that, as time progresses, the object is moving in the negative direction (opposite to the positive direction defined by the coordinate system). Conversely, the velocity vs. time graph will be a horizontal line below the time axis since the velocity is constant and negative. The area under the velocity-time graph (which, in this case, will be above the line because the velocity is negative) represents the book's displacement.
For a book moving with a constant positive velocity, the position vs. time graph shows a straight line with a positive slope, whereas the velocity vs. time graph shows a horizontal line above the time axis.