Question

Show that the given proportions are equivalent.

a+c / b+d = a-c / d-b

and a / b = c / d

Answer 1

are u sure it's a-c/d-b for the 2nd term??

Answer 2

a/b=c/d
->ad=bc

a+c / b+d = a-c / b-d
->(a+c)(b-d)=(a-c)(b+d)
->ab+cb-ad-dc=ab+ad-cb-cd
->2ad=2bc
so the given proportions are equivalent

Answer 3

whoops did it again lol.. no its a-c / b-d ...but i still don't know how to do it

Answer 4

do u understand my answer??

Answer 5

yeah i get it.. thanks some times i have brain farts and once i see it written out im like.. oh i should have known that. thanks again!!