Math Puzzler

1234567891011121314151617181920
Across
  1. 4. A number doubled
  2. 5. A slope increasing from left to right
  3. 11. the number that is multiplied by a variable
  4. 14. Bracets around an equation
  5. 17. The distance around a shape
  6. 19. A slope decreasing from left to right
  7. 20. A number taken away from another
Down
  1. 1. A variation that y varies directly with x
  2. 2. Relation where each input has ONE OUTPUT
  3. 3. something split in half
  4. 6. A variation that x varies inversly with x
  5. 7. A letter that's placed after a number in an equation
  6. 8. points that are placed on lines
  7. 9. A shape with three sides and angles
  8. 10. A straight path that extends infinity in both directions
  9. 12. A slope that is a horizontal line
  10. 13. Rise over Run
  11. 15. Two things put together
  12. 16. The space inside a shape
  13. 18. representing the power of a number