The problem asks us to determine whether the equation $y = x$ is proportional or not.

1. Problem Description

The problem asks us to determine whether the equation $y = x$ is proportional or not.

2. Solution Steps

A proportional relationship between two variables, $x$ and $y$, can be represented by the equation:

$y = kx$

where $k$ is the constant of proportionality. A key characteristic of a proportional relationship is that the graph of the equation is a straight line passing through the origin $(0, 0)$.

The given equation is $y = x$.

We can rewrite this equation as $y = 1 \cdot x$.

Comparing this with the general form of a proportional relationship $y = kx$, we see that $k = 1$. Since the equation is in the form $y = kx$, it represents a proportional relationship. Also, when $x = 0$, $y = 0$, so the line passes through the origin.

3. Final Answer

Proportional