Algebra Terms Crossword Puzzle

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Across
  1. 3. A letter that represents an unknown number
  2. 5. The horizontal line on a graph
  3. 8. The vertical line on a graph
  4. 9. Same on both sides
  5. 13. Not forming a straight line
  6. 15. A flip of a slope over a line
Down
  1. 1. Expressions with variables and exponents
  2. 2. The difference between highest and lowest values
  3. 4. A math phrase with numbers, variables, and operations
  4. 6. When a graph crosses the Y axis
  5. 7. A number showing part of a whole, like 1/2
  6. 10. The average
  7. 11. The number that appears most often
  8. 12. How steep a line is
  9. 14. The middle value in a list