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Across 1. to write in simpler form 4. an example that proves the conclusion false 7. the answer to a problem 8. the set of all ordered pairs 12. a symbol for a number or object 13. the average of a set of numbers 19. the rules you follow to solve a mathematical sentence 20. any positive or negative number, including 0 21. the opposite of a number 22. a number with a <, > sign 23. rules that are true for all numbers

Down 2. making a conjecture based on previous happenings 3. the vertical axis 5. numbers used to locate a point on a coordinate system 6. a number less than 0 9. using facts, properties or rules to reach a valid conclusion 10. the branch of mathematics dealing with variables and equations 11. the distance a number is from 0 14. an equation that contains a variable 15. a mathematical sentence with an equal sign 16. the horizontal axis 17. the set of all x values in the ordered pairs 18. the set of all y values in the ordered pairs