What is the substitution property?
The substitution property is probably one of the most intuitive of the mathematical properties.
You have probably been using substitution without even knowing it.
Examples
![substitution property example 1](image/substitution/substitution-property-example1.png)
![substitution property example 2](image/substitution/substitution-property-example2.png)
![example 3](image/substitution/substitution-property-example3.png)
![example 4](image/substitution/substitution-property-example4.png)