Given an equation determine if y varies directly with x

The video tutorial explains how to determine if Y varies directly with X, focusing on the concept of direct variation. It describes the mathematical form y = KX or y/X = K and highlights the absence of addition or subtraction in such equations. The tutorial demonstrates why a given example cannot be rewritten as a direct variation due to the presence of additional terms that prevent isolating X. The explanation concludes by affirming that the example does not fit the criteria for direct variation.

What is the significance of having no addition or subtraction in the equations for direct variation?

Explain why the example discussed is not an example of direct variation.