Holiday Humbug!

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Across
  1. 5. Lines with slopes that are opposite reciprocals
  2. 6. The set of all input values for which a function is defined.
  3. 9. Any set of ordered pairs
  4. 10. The set of all output values, or y-coordinates, of a function
Down
  1. 1. Change in y / Change in x
  2. 2. Lines with slopes that are exactly the same
  3. 3. Any number represented by the letter "i"
  4. 4. A correspondence or rule that assigns every input to exactly one output
  5. 7. Any value of x for which P(x) = 0
  6. 8. The point where the axis of symmetry intersects the parabola.