| Symmetric |
If one quantity equals a second quantity, then the second quantity equals the first. |
For any numbers a and b
If a = b
Then b = a. |
If 9 = 5 + 4
Then 5 + 4 = 9 |
| Transitive |
If one quantity equals a second quantity and the second quantity equals a third quantity, then the first quantity equals the third quantity. |
For any numbers a, b, and c, if a = b and b = c
then a = c |
If 5+7 = 8+4 and 8+4 = 12
then 5+7 = 12 |
| Substitution |
A quantity may be substituted for its equal in any expression. |
If a = b , then a may be replaced by b in any expression. |
If n = 15 ,
then 3n = 3*15. |