Using Substition to solve each system of equations!?

It is very easy.
First step:
y=-9-2x
3x+y=11
Second step:
y=-9-2x
3x-9-2x=11
Third step:
y=-9-2x
x=20
Forth step:
y=-9-2*20
x=20
Fifth step:
y=-49
x=20