mathematics puzzle

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Across
  1. 2. the coordinate are (0,0)
  2. 4. triangle
  3. 6. solutions
  4. 8. many solutions
  5. 9. equal distant to each other
  6. 11. angle
  7. 12. can be represented by
  8. 13. u shaped curve
  9. 16. distance from y axis
  10. 17. polynomial
  11. 19. point of a straight line
  12. 20. is the longest side
Down
  1. 1. solutions
  2. 3. set of two or more equations
  3. 5. triangle with all sides equal
  4. 7. centre of a circle that inscribes a triangle
  5. 10. cant be expressed as a fraction
  6. 14. is the quadrilateral
  7. 15. single term
  8. 18. is the y- coordinate