math crossword puzzle

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Across
  1. 2. changes direction
  2. 3. line hits x
  3. 8. the set of output value
  4. 9. vertical line
  5. 11. graph rises from left to right
  6. 14. graph that's not a line
  7. 18. negative slope
  8. 20. curved line
  9. 21. line hits y
Down
  1. 1. positive slope
  2. 4. f(x)
  3. 5. graph falls from left to right
  4. 6. the set of input value
  5. 7. > <
  6. 10. straight line
  7. 12. a graph of dots
  8. 13. comparison of rate of change
  9. 15. horizontal line
  10. 16. measurement of a line
  11. 17. ordered pair that is a solution
  12. 19. the number raised an exponent