👉 Substitutions are a process in mathematics, computer programming, and other fields where one variable is substituted for another. In algebraic expressions or equations, they replace one term with another. For example: 1. Let's say we have the equation ax + by = c. To substitute x for y, we would do: ``` (ax)^2 + b(ay) = c ``` So, in this case, a is replaced with x and b is replaced with y
