Algebra crossword puzzle

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Across
  1. 3. The answer to a multiplication problem
  2. 5. Type of function that creates a parabola when graphed
  3. 7. A letter that represents a quantity
  4. 10. All rational and irrational numbers
  5. 11. The answer to an addition problem
  6. 12. Whole numbers and their exponents
  7. 13. Two or more equations
  8. 14. Type of slope of a vertical line
Down
  1. 1. The answer to a division problem
  2. 2. The answer to a subtraction problem
  3. 4. When data is ordered from least to greatest, this is the value that is in the middle
  4. 6. A relation in which every output has exactly one output
  5. 8. The average of a set of data
  6. 9. The change in y-values divided by the change in x-values
  7. 15. The point where a line crosses an axis