Algebra Puzzle

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Across
  1. 1. multiply what in parenthesis
  2. 6. If the number is not a factor of the others you have to do what
  3. 8. Not an equation but a-
  4. 12. the part of mathematics in which letters and other general symbols are used to represent numbers and quantities in formulae and equations.
  5. 13. <
  6. 14. opposite of divide
  7. 15. where the line crosses the x or y
  8. 16. 2+2=4
  9. 18. Use a T to solve the equation
Down
  1. 2. -
  2. 3. opposite of multiply
  3. 4. +
  4. 5. + and -
  5. 7. > or <
  6. 9. x or y
  7. 10. >
  8. 11. coefficient
  9. 17. whole-valued positive or negative number or 0