Question

Tìm x , y biết:

1) ( x - 3 ) y = 8

2) ( x - 1 ) ( y - 1 ) = 7

Answer 1

1: \(\Leftrightarrow\left(x-3;y\right)\in\left\{\left(1;8\right);\left(8;1\right);\left(2;4\right);\left(4;2\right);\left(-1;-8\right);\left(-8;-1\right);\left(-2;-4\right);\left(-4;-2\right)\right\}\)

hay \(\left(x,y\right)\in\left\{\left(4;8\right);\left(11;1\right);\left(5;4\right);\left(7;2\right);\left(2;-8\right);\left(-5;-1\right);\left(1;-4\right);\left(-1;-2\right)\right\}\)

2: \(\Leftrightarrow\left(x-1;y-1\right)\in\left\{\left(1;7\right);\left(7;1\right);\left(-1;-7\right);\left(-7;-1\right)\right\}\)

hay \(\left(x,y\right)\in\left\{\left(2;8\right);\left(8;2\right);\left(0;-6\right);\left(-6;0\right)\right\}\)