👉 Substitutively, also known as substitutionally or simply substitution, is a method of solving mathematical problems where one replaces some variables with their values. It can be used to simplify complex expressions by changing the variable names. For example: 1. Let's say you have an equation like this: 2x + y = 3 Substituting "y" for "x", we get: 2(x) + x(y) = 3 Simplifying,