Question

Solve the equation step by step
I will mark you as a brainlist
1.)12+y=15
2.)2x+3=21
I want step by step explanation only
Then only u will be marked as a brainlist ​

Answer 1

Answer:

1.)12+y=15

y=15-12

y=3

12+3=15

15=15

2.)2x+3=21

2x=21-3

2x=18

x=18÷2

x=9

2(9)+3=21

18+3=21

21=21