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Colt1911 [192]
3 years ago
15

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

Mathematics
2 answers:
Hunter-Best [27]3 years ago
8 0

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

<u>OAmalOHopeO</u>

Sergeeva-Olga [200]3 years ago
7 0

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

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