Algebra Cross Word Puzzle

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Across
  1. 2. a letter or symbol (x or y)
  2. 4. equation an equation with a squared variable
  3. 6. the horizontal axis
  4. 8. finding the value of an expression
  5. 12. where a line crosses the y axis
  6. 15. replacing a variable with a value
  7. 18. a polynomial with 2 terms
  8. 19. the point (0,0) on a graph
Down
  1. 1. an expression with 1 or more terms
  2. 3. root a number multiplied by itself to get another number
  3. 5. a number without a variable
  4. 7. the value that makes the equation true
  5. 9. pair coordinates written like (x,y)
  6. 10. finding the value of an expression
  7. 11. all possible input values
  8. 12. the vertical axis
  9. 13. all possible output values
  10. 14. a math sentence with an equals sign
  11. 16. a method for multiplying two binomials
  12. 17. a single part of an expression separated by + or − signs