Final answer:
Every rational number corresponds to a unique point on a number line means that each rational number can be represented by a specific location on the number line.
Step-by-step explanation:
Every rational number corresponds to a unique point on a number line means that each rational number can be represented by a specific location on the number line. The number line is a straight line that extends infinitely in both directions and is divided into equal intervals. Rational numbers are numbers that can be expressed as a fraction, where the numerator and denominator are integers. For example, the rational number 1/2 corresponds to the point on the number line halfway between 0 and 1.