Question

Answer only (i) (iv)

Answer 1

1) x+5=9( when 5 goes to other side, it becomes minus)
x=9-5=4

4) 9z=81( when 9 goes to other side, it becomes division)
z=81/9
=9..

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Answer 2

1) x+5 =9

both sides 5 subtract

x + 5 - 5 = 9 - 5

x = 4

2) 9z = 81

both sides divedes by 9

9z/9 = 81/9

z = 9