Answer:
x = 3
s = 11
z = 14
y = 2
Let me know if you need an explanation for this, I would be happy to help :)
1. x = 3
2. s = 11
3. z = 14
4. y = 2
Explanation:
1. x + 9 = 12
12 - 9 = x
⇒ x = 3
2. s - 1 = 10
10 + 1 = s
⇒ s = 11
3. 3 = z - 11
z - 11 = 3
11 + 3 = z
⇒ z = 14
4. 5 + y = 7
7 - 5 = y
⇒ y = 2
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