Algebra words

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Across
  1. 2. goes left to right
  2. 4. goes up and down
  3. 6. the highest point
  4. 9. put it on a plot
  5. 10. ratio of vertical change
  6. 12. the starting point
  7. 14. the slope
  8. 15. the lowest point
Down
  1. 1. a straight line
  2. 3. can be a fraction
  3. 5. the answer to the problem
  4. 7. not a straight line
  5. 8. cannot be a fraction
  6. 11. the problem
  7. 13. it is the same