algebra stuff

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Across
  1. 2. The number behind a variable
  2. 4. a graph that travels in a straight line
  3. 6. a U-shaped graph that results from a squared variable
  4. 7. where a equation crosses the x intercept
  5. 8. equal differences over equal intervals
  6. 9. used for quadratic equations
  7. 11. the horizontal line on a graph
  8. 13. the vertical line on a graph
Down
  1. 1. able to assume different numerical values usually represented by a letter
  2. 3. equal factors over equal intervals
  3. 5. an expression involving one or more variables
  4. 6. a algebraic equation that includes more than 3 terms
  5. 10. observed minus predicted
  6. 12. the ratio of a circle's circumference to its diameter
  7. 14. (y2-y1)/(x2-x1)