Question

When you write a statement such as a=9, what axiom of equality allows you to change it to 9=a?

Answer 1

The symmetric property of equality.
If a = b, then b = a.

Answer 2

The axiom of equality used in a = 9 and 9 = a is the symmetric property of equality.

How to determine the axiom of equality?

The equations are given as:

a = 9 and 9 = a

The symmetric property of equality states that:

If a = b, then b = a

Hence, the axiom of equality used in a = 9 and 9 = a is the symmetric property of equality.

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