Question

3x+4y-xy=16

Answer 1

3x+4y-xy=16
<=>x(3-y)-12+4y=16-12
<=>x(3-y)-4(3-y)=4
<=>(3-y)(x-4)=4
[4=1*4;-1*-4]
Đáp số:
(x;y)={(8;2);(5;-1);(0;4);(3;7)}