Algebra-2

1. Understand joint variation:

When a variable varies jointly with two other variables 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 cost problem:

Given that the cost of a product varies jointly with its quantity and price per unit .

The correct equation is , where is a constant.

 

Let's analyze the other options:

A.For the equation

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