What is the value of \( a \) in the equation \( 3a + b = 54 \) when \( b = 9 \)?

A. 15
B. 18
C. 21
D. 27

{ b = 9 3 a + b = 54 ​ S u b s t i t u t i o n 3 a + 9 = 54 ∣ s u b t r a c t 9 3 a = 45 ∣ d i v i d e b y 3 a = 15 b = 9

Answered by luana | 2024-06-24

3 a + b = 54 3 a + 9 = 54 3 a = 54 − 9 3 a = 45 a = 3 45 ​ → 15 ​

Answered by mariamikayla | 2024-06-29

The value of a in the equation 3 a + b = 54 when b = 9 is 15. This is found by substituting 9 for b , simplifying, and isolating a . The correct answer is A. 15 .
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Answered by mariamikayla | 2024-08-09