Math Crossword puzzle

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Across
  1. 1. number expressed as a quotient
  2. 3. incline of a line
  3. 7. the unknown factor
  4. 8. small number next to number that tell how many times it will be multiplied
  5. 10. more than two algebraic terms
  6. 11. process of equating one thing to another
  7. 12. diagram that represents data
  8. 16. whole valued number being negative or positive
  9. 17. number used to multiply a variable
  10. 18. square root
  11. 19. number that generally stays the same
Down
  1. 2. number that can be written as a fraction
  2. 4. area contained by the x and y axes
  3. 5. number that can't be written as a fraction
  4. 6. multiplication rule
  5. 9. set of values allowed to be used
  6. 13. highest and lowest set of numbers
  7. 14. the beginning point
  8. 15. even division
  9. 16. point on y-axis which the slope of a line passes through