algebra puzzle

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Across
  1. 3. undoes
  2. 5. raised symbol
  3. 9. two
  4. 10. 5:6
  5. 11. four or more
  6. 13. ax+by=c
  7. 16. form y=mx+b
  8. 18. crosses the x axis
  9. 19. finding a solution
Down
  1. 1. a whole number
  2. 2. three
  3. 4. form y-y1=m(x-x1)
  4. 6. one
  5. 7. a letter next to the number
  6. 8. four corners
  7. 12. crosses the y axis
  8. 14. lines don't intercept
  9. 15. lines
  10. 16. rise over run
  11. 17. exponent is 0