Question

Resolva o sistema:
xy=10 (I)
(x-1)(y+1)=6 (II)

Answer 1

xy=10

(x-1)(y+1)=6

x=10/y

(10/y-1)(y+1)=6

(10-1)(y+1)=6y

10y+10-y-1=6y

10y-6y-y= -10+1

3y= -9

y= -9/3

y= -3

x= 10/y

x= 10/-3

x= -3,33...

Espero ter ajudado!!!