Answer:
symmetric property of equality
Explanation:
The property illustrated here is the symmetric property of equality, which states that if a = b, then b = a. In this case, the property is demonstrated by the fact that the equation 3x = y is equivalent to the equation y = 3x, meaning that the two sides of the equation can be swapped without changing the truth value of the equation. This is an example of the symmetric property because the order of the variables has been reversed while still maintaining equivalence.