Algebra crossword puzzle

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Across
  1. 2. A chart used to represent data
  2. 4. Difference between the largest and smallest numbers in a data set
  3. 6. Numbers used for counting
  4. 7. one math statement
  5. 8. Reduce
  6. 9. Two lines that never intersect
  7. 10. Number that shows the steepness and direction of the line.
Down
  1. 1. a symbol or letter that represents a value
  2. 3. X variable in a function
  3. 5. Expression of different variables