Math Crossword Puzzle

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Across
  1. 4. A rule that assigns exactly one output to each input.
  2. 6. A math sentence showing two expressions are equal.
  3. 8. Measures how steep a line is—rise over run.
  4. 10. A math phrase with numbers, variables, and operations—but no equals sign.
  5. 11. Formed by two rays sharing a common endpoint.
  6. 13. A symbol that stands for another number
  7. 14. Describes figures that are the same size and shape.
  8. 15. The average of a set of numbers.
Down
  1. 1. All possible output values of a function.
  2. 2. A shape with three sides and three angles.
  3. 3. A comparison using symbols like <, >, ≤, or ≥.
  4. 5. A straight path that extends forever in both directions.
  5. 7. The point where a graph crosses the vertical axis.
  6. 9. The middle value in an ordered list of numbers.
  7. 12. All possible input values for a function.