Algebra is Amazing

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Across
  1. 3. a polynomial with three terms
  2. 5. a function with a straight-line graph
  3. 6. lines lines that never intersect
  4. 9. the point (0,0) on a coordinate plane
  5. 11. a value that does not change
  6. 12. the steepness of a line
  7. 13. a comparison of two quantities
  8. 15. when two lines cross
Down
  1. 1. a letter representing an unknown number
  2. 2. a pattern where the same number is added each time
  3. 4. the result of addition
  4. 7. a U-shaped graph of a quadratic function
  5. 8. the distance a number is from 0 on a number line
  6. 10. a relation where each input has exactly one output
  7. 14. a line that goes downward from left to right