Linear equations and rational numbers

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Across
  1. 2. expression with 2 terms
  2. 5. Property E.g.a+b=b+a
  3. 7. Property E.g.a+(b+c)=(a+b)+c
  4. 10. Property E.g.a(b+c)=(a×b)+(a×c)
  5. 12. type of numbers on a number line
  6. 14. represented using '-'
  7. 15. alphabet used to represent an unknown value
  8. 17. expression with 3 or more terms
  9. 18. represented using '+'
  10. 19. the answer
Down
  1. 1. non-stopping
  2. 3. expression with 1 term
  3. 4. occurring repeatedly
  4. 6. the number in the expression whose value is known
  5. 8. a collection of symbols that jointly Express a quantity
  6. 9. expression with 3 terms
  7. 11. stopping at a point
  8. 13. to equate 2 2 values using the '=' sign
  9. 16. Property E.g.a+b=c