SOLUTION: Im suppose to show how a-b/a+b = c-d/c+d is proportional to a/b=c/d

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Question 106510: Im suppose to show how
a-b/a+b = c-d/c+d
is proportional to
a/b=c/d
Answer by edjones(8007) About Me  (Show Source):
You can put this solution on YOUR website!
a-b/a+b = c-d/c+d
.
ac+ad-bc-bd=ac-ad+bc-bd multiply both sides by (a+b)(c+d) to eliminate fractions.
ad-bc=-ad+bc cancel off ac and bd
2ad=2bc add ad and bc to each side
ad=bc divide each side by 2
a/b=c/d divide each side by bd.
.
Ed