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Patty Inglish says
Solve the second equation for either X or Y and substitute that expression into the first equation. Then determine both X and Y.

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Raj Lally Batala says
3x2y=12
3x= 12+2y
x = (12+2y)/3
Now put this value in
2x y =1 not sure if that is + or 
2(12+2y)/3y = 1
(24+4y)/3y=1
24+4y3y=3
24+y =3
y=324
y=21
and then calculate x
let me know if you got problems

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