Algebra-2

1. Understand the concepts of joint and inverse variation:

When a variable  varies jointly with a variable , it means  is directly proportional to . Mathematically, it can be written as  where  is the constant of proportionality.

 

When a variable  varies inversely with a variable , it means  is inversely proportional to , and the relationship is

 

 If a variable  varies jointly with  and inversely with , the relationship is

 

2. Apply to the wave problem:

Given that the frequency  of a wave varies jointly with its speed  and inversely with its wavelength .

The correct equation is