Substitution Not every system can be solved easily by graphing. Sometimes it is not always clear from the graph where the solution is. We can use an algebraic method called SUBSTITUTION to find the exact solution without a graphing calculator.
Step 1: Solve for one of the variables. Step 2: Substitute the expression of the equation you solved for into the other equation. Step 3: Solve for the variable. Step 4: Substitute the value of x into either equation and solve.