The document provides steps for solving systems of equations using the elimination method with addition and subtraction: 1. Put both equations in standard form. 2. Determine which variable to eliminate by finding terms with the same coefficients. 3. Add or subtract the equations to eliminate the chosen variable. 4. Substitute and solve for the remaining variable and plug back into one equation to solve for the other. 5. Check the solution by substituting the values back into both original equations.