What is the value of the y variable in the solution to the following system of equations?.
3x - 6y = 3
7x - 5y = -11

What is the value of the x variable in the solution to the following system of equations?.
2x - y = 6
4x - 2y = 12

What is the value of the x variable in the solution to the following system of equations?.
4x + 2y = 12
x - y = 3