if a and b are integers, which equation is always true

1 a/b= b/a
2 a-b= b-a
3 a+2b= b+2a
4 a+b=b+a

3 answers

4, because if a is 3 and b is 5, 1) 3/5=.6, but 5/3=1.66, 2) 3-5=-2, 5-3=2, 3) 3+(10)=13, 5+(6)=11, 4) 3+5=8, 5+3=8
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