Posted by anna on Friday, January 25, 2013 at 1:29am.
i did use my poof to prove. im not sure im doing right.
here is exercises:
'Suppose a,b,c are integers if ab and ac, then a(b+c).'
my answer:
Proof. Suppose ab ans ac.
By Definition of divisibility. we know ab means there is an integer x with b= ax.
Likewise, ac means there is an integer y for which c= ay
Thus b+c=(ax+ay)= a(x+y)
therefore a(b+c).

elementary math  Steve, Friday, January 25, 2013 at 11:26am
Looks good to me.

elementary math  anna, Friday, January 25, 2013 at 2:33pm
thank you..
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