3) Fill in the blanks to complete the steps. How to Use Substitution to Solve a Nonlinear System of Equations Step 1: Choose the variable to . {This will be the variable you substitute.) Choose a variable in a linear equation. DR 0 Choose a variable that is in both equations. Step 2: Use inverse operations to isolate that Step 3: the isolated variable into the other equation in the system. Step 4: Now that equation has one variable. Solve the for that variable. Step 5: your solutions into any of the original equations in the system