a) vô nghiệm
b)
x(y+3)-2(y+3)=11-6=5
(y+3)(x-2)=5
y+3={-5,-1,1,5}=> y={-8,-4,-2,2}
x-2={-1,-5,5,1}=> x={2,-3,7,3}
\(\left(x,y\right)=\left(2,-8\right);\left(-3,-4\right);\left(7,-2\right);\left(3,2\right)\)
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