Answer: 5 units
Step-by-step explanation:
Connect points A and B to another point at (1, -1) to form a right triangle.
One leg of the triangle (a) is 3 units long, and the other (b) is 4 units long.
Since this is a right triangle, use the Pythagorean theorem to find the length of the third leg, which is the distance between A and B.
