I can't figure out these two systems of equations...?

Question

1)
x = 7
2x + 6y = 44
-x + 7y - 2z = 22

2)
x = 3
5x + 4y = -9
-x + 4y - 2z = -25

Answer 1

Question 1
14 + 6y = 44
6y = 30
y = 5

- 7 + 35 - 2z = 22
- 2z = - 6
z = 3

x = 7 , y = 5 , z = 3

Question 2
15 + 4y = - 9
4y = - 24
y = - 6

- 3 - 24 - 2z = - 25
- 2z = - 8
z = 4

x = 3 , y = - 6 , z = 4