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Across 1. The two perpendicular lines of a coordinate plane that intersect at the origin 4. The distance of a number from zero on a number line 5. The numbers of an ordered pair that locate a point on a coordinate graph 8. Two numbers that are an equal distance from zero on a number line 9. An input-output relationship that has exactly one output for each input 10. The second number in an ordered pair; it tells the distance to move up or down from the origin. 11. A number less than zero 13. The value substituted into an expression or function 14. The first number in an ordered pair; it tells the distance to move right or left from the origin. 15. The point where the x-axis and y-axis intersect on the coordinate plane 16. A plane formed by the intersection of a horizontal number line call the x-axis and a vertical number line called the y-axis

Down 2. The horizontal axis on a coordinate plane 3. A number greater than zero 6. An equation whose solutions form a straight line on a coordinate plane 7. A member of the set of whole numbers and their opposites 8. The value that results from the substitution of a given input into an expression or function 10. The vertical axis on a coordinate plane 12. The x- and y-axes divided the coordinate plane into these four regions