Question

WHAT IS THE VALUE OF A IN 3A + B = 54 BUT WE B=9

Answer 1

3A + 9 = 54
Subtract 9 from both sides
3A = 45
Divide both sides by 3
A = 15

Answer 2

Answer:
`A=15`

Explanation:

You have the following equation:

`3A + B = 54`

In order to find the the value of the variable "A" when
`B=9`, you need to substitute this value of "B" into the equation and then you must solve for "A".

Applying this procedure, you get:

`3A + B = 54\\\\ 3A + 9 = 54\\\\3A=54-9\\\\3A=45\\\\A=(45)/(3)\\\\A=15`