Question

show the steps of how got the answer

Answer 1

Answer:

Step-by-step explanation:

f-  -3u=21 divide each side by (-3)

-3u/-3=-21/3

u=-7

g) 23+a=12  use subtraction method , subtract 23 from both sides

23-23+a=12-23

a=-11

h) -9+b=15  use additional method, add 9 to both sides

-9+9+b=15+9

b=26