It seems like you are asking about a relationship that describes how the value of \( y \) is always eight times the value of \( x \) in the context of a mathematical equation.
From what you've described, you can express this relationship using the equation:
\[ y = 8x \]
In this equation, \( y \) is directly proportional to \( x \) with a constant of proportionality equal to 8.
If you are referring to the exponential form with the equation \( y = e^x \), that suggests a different relationship, typically associated with exponential growth or decay, where \( e \) is a constant approximately equal to 2.718. However, for the proportionality stating that \( y \) is always eight times \( x \), the correct expression would be \( y = 8x \).
If you need further clarification or additional mathematical concepts explored, please provide more details!