Math crossword puzzle

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Across
  1. 2. A letter that stands for a number (like x or y)
  2. 5. A math expression with one or more terms.
  3. 9. A math phrase with numbers and variables but no equals sign
  4. 11. A math sentence with an equals sign
  5. 12. A math equation that is always true for all values.
  6. 13. The point where x and y axes meet.
  7. 14. One of the four parts of a graph.
  8. 15. The number in front of a variable
Down
  1. 1. An expression with three terms.
  2. 3. An expression with two terms.
  3. 4. The highest power of the variable in a term or polynomial.
  4. 6. A line on a graph
  5. 7. The value that makes an equation true.
  6. 8. A number with no decimal, like -2, 0, or 5.
  7. 10. A basic rule in geometry accepted without proof.