b) $x(y-3)=-12$
c) $(x-3)(y-3)=9$
câu b
[laTEX]x = 1 , y -3 = -12 \Rightarrow y = -9 \\ \\ x = -1 , y-3 = 12 \Rightarrow y = 15 \\ \\ x= 2 , y-3 = -6 \\ \\ x = -2 , y -3 = 6 \\ \\ x = 3 , y-3 = -4 \\ \\ x = -3, y -3 = 4 \\ \\ x = 4 , y -3 = -3 \\ \\ x = -4 , y-3 = 3 \\ \\ x = 6 , y-3 = -2 \\ \\ x = -6 , y-3 = 2 \\ \\ x = 12 , y-3 = -1 \\ \\ x = -12 , y-3 = 1 [/laTEX]
câu c
[laTEX] x -3 = 1 , y-3 = 9 \\ \\ x-3 = -1 , y-3 = - 9 \\ \\ x-3 = 3 , y -3 = 3 \\ \\ x -3 = -3 , y-3 = - 3 [/laTEX]
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