Х²-2у-3х+8=0
2х-у=1 => у=2х-1
х²-2*(2х-1)-3х+8=0
х²-4х+2-3х+8=0
х²-7х+10=0
D = (-7)² - 4·1·10 = 49 - 40 = 9
x1 = (7 - √9)/(2·1) = (7 - 3)/2 = 4/2 = 2 у1=2*2-1=4-1=3
x2 = (7 + √9)/(2·1) = (7 + 3)/2 = 10/2 = 5 у2=5*2-1=10-1=9
Два ответа
х=2, у=3 и х=5, у=9