Linear functions cross word

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Across
  1. 2. the relation where every input has one output
  2. 4. the steepness of a line
  3. 8. the point (0,0) on a coordinate plane
  4. 9. the number value that is being times by the variable
  5. 12. a line that will never touch another line
  6. 15. a line that goes up and down
Down
  1. 1. the values that make up a true equation
  2. 3. a line that goes side to side
  3. 5. this is a line that intercets with another line at 90 degrees and the slopes are oposite reciprocals
  4. 6. the set of all possible input x values
  5. 7. a letter or symbol representing an unknown value or number
  6. 10. a number that does not change in the equation
  7. 11. an area where a function or line is written
  8. 13. a relationship that creates a line on a graph
  9. 14. the set of all possible output y values