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If the ratio of a to b is r, then express the ratio of a + b to a - b in terms of r.

 Dec 30, 2019
 #1
avatar+58 
+3

Hmmm..

Yay now I figured it out!!!!

We know that a/b = r

Then a = rb

so a + b = rb + b = b(r + 1)

a - b = rb - b = b(r - 1)

Therefore the ratio is (b(r+1))/(b(r-1))

This is just (r+1)/(r-1)

And that's the answer!!!!!

 Dec 30, 2019
 #2
avatar+106516 
0

THX, OlympusHero!!!!

 

 

 

cool cool cool

CPhill  Dec 31, 2019

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