Algebra Rules

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Across
  1. 5. If a=b and b=c, then a=c
  2. 6. (a+b)+c=a+(b+c)
  3. 7. a=a
  4. 8. If a=b,then b=a
Down
  1. 1. a+b=b+a
  2. 2. elements a+0=a,a.1=1
  3. 3. axaxaxaxax....xa/n times
  4. 4. a+(-a)=0