The property that justifies y = 30 is the transitive property
<h3>How to determine the property?</h3>
From the question, we have the following equations that can be used in our computation:
x = y
Also, we have
x = 30
The transitive property of equation states that:
If a = b and b = c, then a = c
In this case, the transitive property of equation would be the following representation
If x = y and x = 30, then y = 30
So, we can conclude that the property that justifies the equation of y is the transitive property
Read more about transitive property at
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