Put the steps in order that are used to solve the following systems of equations by substitution.
-7x-2y= -13 x-2y=11
1. Solve one of the equations for one variable.
2. Substitute the expression from step 1 into the other equation.
3. Solve for the remaining variable.
4. Substitute the value found in step 3 back into the equation from step 1.
5. Solve for the last variable.