non-linear crossword puzzle

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Across
  1. 4. bent graph line
  2. 5. 0,0
  3. 7. -
  4. 10. +
  5. 11. straight line
Down
  1. 1. y=mx+b
  2. 2. middle of parabola
  3. 3. rise over run
  4. 6. curvey line
  5. 8. x,y
  6. 9. squared, cubed