Question

Show all steps used to solve the problem. One point for steps and one point for solution. Be sure that you check your solution for correctness.
If 3a - 9 = 6, what is the value of 4a - 1?

Answer 1

3a-9=6
3a=15
a=5
Plug in:
4a-1=?
4(5)-1=?
20-1=19
19

Answer 2

solve: 3a-9=6
then plug a in for : 4a-1

solving:
3a-9=6 add 9 to both sides
3a=15 divide both sides by 3
a=5
plug in
4(5)-1
20-1
19

Answer 3

i suppose, you should plug back in, since it says to:

3(5)-9=6
15-9=6
6=6
it checks