Rational Explorations Review

Positive numbers are greater than 0. Negative numbers are less than 0. You can graph positive and negative numbers on a number line. The positive numbers are to the right of zero and the negative numbers are to the left of 0. Absolute value is the distance from zero on a number line. Because it refers to a distance, the absolute value is always positive.

Opposite numbers are two different numbers that have the same absolute value.

A coordinate plane is formed by two number lines in a plane that intersect at right angles. The two number lines intersect at 0 on each number line and this point of intersection is called the origin. The two number lines are called axes. The horizontal axis is called the x-axis. The vertical axis is called the y-axis. The coordinate plane is divided into 4 sections called quadrants. The x-coordinate tells how far to move right (positive) or left (negative) from the origin. The y-coordinate tells how far to move up (positive) or down (negative). Just remember, x comes before y in the alphabet, so you will always move along the x-axis first.

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