Câu 7:
a: =>xy=6
hay \(\left(x,y\right)\in\left\{\left(1;6\right);\left(6;1\right);\left(-1;-6\right);\left(-6;-1\right);\left(2;3\right);\left(3;2\right);\left(-2;-3\right);\left(-3;-2\right)\right\}\)
b: =>xy=-6
hay \(\left(x,y\right)\in\left\{\left(1;-6\right);\left(-6;1\right);\left(6;-1\right);\left(-1;6\right);\left(2;-3\right);\left(-3;2\right);\left(-2;3\right);\left(3;-2\right)\right\}\)
c: =>4x=3y
d: =>x/3=y/-4
=>-4x=3y
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