MATHEMATICAL CROSSWORD 2

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Across
  1. 1. A number with only two factors, 1 and itself
  2. 3. A method of solving equations by replacing a variable
  3. 5. Shape of the graph of a quadratic polynomial
  4. 7. A method of solving using lines on a plane
  5. 9. Type of lines giving no solution
  6. 10. Describes a pair of equations with at least one solution
  7. 14. An algebraic expression with terms involving non-negative powers
  8. 15. A number with more than two factors
  9. 16. A value of x where p(x) = 0
  10. 17. Type of lines giving infinite solutions
Down
  1. 2. A number expressible as p/q, q≠0
  2. 4. A number that cannot be written as p/q
  3. 6. The highest power of the variable in a polynomial
  4. 8. A method of solving by removing one variable
  5. 11. The number multiplying a variable term
  6. 12. Type of decimal expansion ending after finite digits
  7. 13. Type of lines giving a unique solution