Question

x(2y+1)=10

 

Answer 1

\(\Leftrightarrow\left(x,2y+1\right)\in\left\{\left(1;10\right);\left(10;1\right);\left(-1;-10\right);\left(-10;-1\right);\left(2;5\right);\left(5;2\right);\left(-2;-5\right);\left(-5;-2\right)\right\}\)

\(\Leftrightarrow\left(x,y\right)\in\left\{\left(1;\dfrac{9}{2}\right);\left(10;0\right);\left(-1;-\dfrac{11}{2}\right);\left(-10;-1\right);\left(2;2\right);\left(5;\dfrac{1}{2}\right);\left(-2;-3\right);\left(-5;-\dfrac{3}{2}\right)\right\}\)