Question

Could someone explain each one of these questions (apart from a) step by step? Thanks!

Answer 1

When in algebra, you can do the same to both sides. Here is a simple example that will hopefully make things easier.

Answer 2

part c:

100-3t = 64

100-64 = 3t

36 = 3t

t = 12

part d:

1/2 (x-5) = 9

x-5 = 9 / (1/2)

x-5 = 18

x = 23