Question

Решить систему xy=36 x-y=-5

Answer 1

x=y-5
y(y-5)=36

x=y-5
y²-5y-36=0

D=25+36*4=169=13²

y=(5-13)/2=-4
x=-4-5=-9

y=(5+13)/2=9
x=9-5=4