Answer:
z = 4 , y = 6 , 4 and 13
Explanation:
1
8z - 15 = 17 ( add 15 to both sides )
8z = 32 ( divide both sides by 8 )
z = 4
2
22 = 4y - 2 ( add 2 to both sides )
24 = 4y ( divide both sides by 4 )
6 = y
3
3(- 7) + 25 = - 21 + 25 = 4
4
16 - 6 ÷ 2 ← perform division before subtraction
= 16 - 3
= 13
For the middle par, using the answers associated to the colours
13 + (6 ÷ 4) - 4
= 13 + 1.5 - 4
= 14.5 - 5
= 10.5