if: a-b |a ,which of these is correct and why? 1)a+b|a 2)a+b|b 3)a-b|b 4)a+b|a-b?

Question

if: a-b |a ,which of these is correct and why? 1)a+b|a 2)a+b|b 3)a-b|b 4)a+b|a-b?

Answer 1

the answer is 3 because a-b|a-b & a-b|a so a-b|b

Answer 2

a-b|a means that a-b=k.a than a-b=(k-2)a +2a

than -a-b=(k-2)a

a+b=(2-k)a let p=2-k than a+b=p.a that means that a+b|a