How do you solve \frac { 1} { 3} = \frac { r - 8} { r + 20}?
1 Answer
Mar 29, 2017
Explanation:
The method of cross product or cross multplication is applied.
1/3=(r-8)/(r+20
1(r+20)=3(r-8)
Using the distributive property;
r+20=3r-24
Group like terms
20+24=3r-r
Simplify
44=2r
Divide both sides by
(cancel(2)r)/cancel2=44/2
r=22