Use the method of substitution to solve the system of linear equations. 4x-y=4 9x-2y=11

I am a lost soul with this one. someone please help!

4x - y = 4 ====> y = 4x - 4
9x - 2(4x - 4) = 11
9x - 8x + 8 = 11
x + 8 = 11
x = 3
y = 12 - 4
y = 8

4x-y=4,
9x-2y=11,
--------------
y=4x-4,
9x-2(4x-4)=11,
9x-8x+8=11,
x+8=11,
x=11-8,
x=3,
--------------------
y=4(3)-4,
y=12-4,
y=8.
Answer: x=3, y=8. (3, 8).

Can someone answer my physics question?

y=4x-4
Replace in other eq---> 9x-2(4x-4)=11
9x-2x+8=11
7x=3 x=3/7
y=4*3/7-4
y=12/7-28/7
y=-16/7
Veriyfy calculation but that's the method