2) A (3; 1), B (3; −4), C (-1; 5)

Let's plot these points on the coordinate plane:

• Point A (3; 1): From the origin, move 3 units to the right on the x-axis and 1 unit up on the y-axis.
• Point B (3; -4): From the origin, move 3 units to the right on the x-axis and 4 units down on the y-axis.
• Point C (-1; 5): From the origin, move 1 unit to the left on the x-axis and 5 units up on the y-axis.

These points are ready to be marked on the graph.