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. For example, we can solve the second equation for x: x = 2y + 11.
2. Substitute the expression found in the first step into the other equation. So we substitute x with 2y + 11 in the first equation: -7(2y + 11) - 2y = -13.
3. Solve the new equation for the remaining variable. This will give you the value of y.
4. Substitute the value of y back into the equation found in step 1 to find the value of x.