PLEASE HELP ME ASAP the question is on the screen shot, i will mark brainliest if you help this is due today

Answer:
first one
Step-by-step explanation:
In order to get a by itself you need to move the +3 to the other side then it becomes a=18-3. To get b by itself you need to move the 4 to the other side so you have to divide it then it becomes b=32/4