Across
- 3. a letter that represents a number
- 4. a set of numbers in the form (x,y)
- 6. the vertical axis
- 9. x+y=y+x is an example of this property
- 12. x(y+z)=xy+xz
- 16. the intersection of two number lines
- 17. the set of all of the first numbers in a set of ordered pairs
- 18. the set of all of the second numbers in a set of ordered pairs
- 19. the set of natural numbers and zero
Down
- 1. the set of counting numbers
- 2. the vertical placement of an ordered pair
- 5. x(yz)=(xy)z is an example of this property
- 7. the horizontal axis
- 8. any number that cannot be written as a ratio of two numbers
- 10. the point where the xaxis and yaxis intersect
- 11. x+0=x is an example of this property
- 13. whole numbers and their opposites
- 14. the horizontal placement of an ordered pair
- 15. any number that can be written as a ratio of two numbers