Given that the system of equations 3x + y = 124x + ay = 2 has positive integer solution (a is an integer), find the value of A In two ways,

1 times 4, 2 times 3, then 1-2
（4-3a)*y=42
y=42/(4-3a) a

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1. Given that the system of equations {3x + y = 12 has positive integer solution (a is an integer), find the value of A. 4x + ay = 2
2. Given that the system of equations 3x + y = 124x + ay = 2 has integer solution (a is an integer), find the value of A Pay attention to the topic, answer quickly, in a few minutes!
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