-8у+х=1
у²-х=8
-у(8-у)=9
-8у+у²-9=0
у²-8у-9=0
D=64-4*(-9)=64+36=100=10²
х = 8±10 / 2 = -2/2; 18/2 = -1; 9.
-8у=1-х
-8у=1-(-1)
-8у=2
у=-1/4 = -0.25
-8у=1-9
-8у=-8
у=1
ответ: (-1; -0.25), (9; 1).
