Question

Решите систему уравнений
x^2-y^2=7
xy=12

Answer 1

y=12/x
x^2-(12/x)^2=7

x^2=d
d^2-7d-144=0
x= 4,-4; -9 - н.у.з.
y1 = 12/4 = 3
y2=12/-4=-3