MATH WORD PUZZ

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Across
  1. 2. a unknown numerical value in a equation
  2. 6. a relation between a set of inputs having one output each
  3. 9. the result of one or two terms together
  4. 10. distance from the center of a circle to any point on the boundary
  5. 11. the study of variables and the rules for manipulating variables in formulas
  6. 13. the result of 2 numbers multiplied together
  7. 14. two expressions which are connected to equal something
  8. 16. a quantity that can be changed and is not fixed
Down
  1. 1. a collection of ordered pairs containing one object from each set
  2. 3. the number below a common fraction
  3. 4. the take away of sum
  4. 5. the fact or rule written in math symbols
  5. 6. a number divided into a given number evenly
  6. 7. a number with no decimal or fractional part
  7. 8. a branch of mathematics containing shapes and space
  8. 12. operation of how many times a number is added to itself
  9. 15. the vertical axis on a coordinate plane