Algebra Crossword Puzzle

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Across
  1. 1. Natural Numbers together with “zero”
  2. 3. Another name for counting numbers
  3. 4. collection of all input values
  4. 5. All Rational and Irrational numbers
  5. 7. What is the "M" in y= mx + b?
  6. 10. Type of open number sentence
  7. 13. The vertical line on a graph
  8. 14. The span of numbers found by subtracting the smallest number from the highest number in a set
  9. 17. Name for (0,0)
  10. 18. When you multiply a number by its multiplicative inverse you get 1.
  11. 19. Positive and Negative whole numbers
  12. 20. The horizontal line on a graph
  13. 21. A symbol that represents a number
Down
  1. 2. A math sentence that contains an equal sign
  2. 6. Distance from zero
  3. 8. The number in front of a variable
  4. 9. The point where the graph crosses the Y axis
  5. 10. Cannot be expressed as a ratio of integers.
  6. 11. A "U-shaped" graph created from a quadratic function.
  7. 12. Type of graph to analyze data
  8. 15. Numbers below zero are called?
  9. 16. A number on its own is called?