Algebra crossword puzzle

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