Mathematics, 02.02.2020 09:44 couscous5307

The sum of a number and 3 times a second number is represented by a+3b=39. the sum of half of the first number and 1/3 of the second number is represented by 12a+13b=9.
what is the first number (a)?
a =
what is the second number (b)?
b =
i need i keep getting something unreasonable

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The sum of a number and 3 times a second number is represented by a+3b=39. the sum of half of the fi...