Question

find the value of a so, that x=1 ,y=2 is a solution of 3x + ay = 9​

Answer 1

Answer:

3

Step-by-step explanation:

3(1)+a(2)=9

3+2a=9

2a=9-3

   =6

a=6/2

 =3

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Answer 2

Step-by-step explanation:

$3x + ay = 9 \\ putting \: the \: value \: x = 1 \: \: y = 2 \\ 3 \times 1 + a \times 2 = 9 \\ 3 + 2a = 9 \\ 2a = 9 - 3 \\ 2a = 6 \\ a = \frac{6}{2} \\ a = 3 \\ \\ \\ hope \: it \: helps \: u.................................................$