Algebra-2

1.Understand joint variation:

When a quantity  varies jointly as two other quantities  and , it means that  is directly proportional to the product of  and .

 

The general equation for joint variation is , where  is the constant of proportionality.

 

2. Apply to the problem:

In the case of electric power , which varies jointly with voltage  and current , the correct equation is .

 

Let's analyze the other options:

A.For the equation

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