Question

решить функцию х^2-у^2=8 х-у=4!

Answer 1

$x=4+y \\ \\ (4+y)^2-y=8 \\16 +8y+y^2 -y^2=8 \\ \\ 8y=-8; \ \ \ y =-1 \\\\ x=4+(-1)=4-1=3 \\ \\ \\ (3;-1)$