The system of equations is:
To solve by substitution, first we need to isolate one of the variables. However, this is already done in the first equation.
Next, we want to substitute x into the other equation, so let's do that:
Notice that we divide both sides by two to simplify our work:
Now we isolate y:
Now that we have y, we substitute in either equations to find x. Let's do it in the first one:
So, y = 3 and x = 11.