In the system below, use equation (1) with equation (2) to eliminate x. Then use equation (1) with equation (3) to eliminate x. x-y-2z=4 (1)

-x+3y-z=8 (2)

-2x-y-4z=-1 (3)

What is the new 2 × 2 system?

2y – 3z = 12
–3y – 8z = 7

2y – 3z = 12
–3y + 8z = 7

2y – 3z = 12
–2y – 6z = 3