Question

What is the value of a in the equation 3 a plus b equals 54, when b equals 9?

Answer 1

Answer:

$3a+b=54$

$3a+9=54\:[b=9]$

$3a=54-9$

Subtract 9 from both sides

$3a=45$

Divide both sides by 3

$\frac{3a}{3}=\frac{45}{3}$

$a=15$

OAmalOHopeO

Answer 2

Answer:

a=15

Step-by-step explanation:

3a+b = 54

Let b=9

3a+9 = 54

Subtract 9 from each side

3a+9-9= 54-9

3a = 45

Divide each side by 3

3a/3 = 45/3

a = 15