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Math definition of Substitution: Substitution - A strategy for solving systems of equations that include solving for one variable and using that solution to find the other variable. 1  Subject : Math.  Topic : Algebra 2.
Study of substitution method and its definition. As discussed above, the substitution method will be used when you have a system of equations. Systems which require solving by substitution method usually have 2 or more variables. The substitution method definition is very simple: You have to find the solution of a system of equations. In order to make use of the algebra substitution method, write one of your equation in terms of x and y and then substitute the result of the variable into the other equation.