Question

(x+3)(y-1)=-5

x(x+y)=2

Answer 1

a) (x + 3)(y - 1) = -5

Có 4 TH xảy ra :

TH1 : x + 3 = 1 => x = -2

          y - 1 = -5 => y = -4

TH2 : x + 3 = -5 => x = -8

          y - 1 = 1 => y = 2

TH3 : x + 3 = -1 => x = -4

          y - 1 = 5 => y = 6

TH4 : x + 3 = 5 => x = 2

          y - 1 = -1 => y = 0

b) x(x + y) = 2

Có 4 TH xảy ra : 

TH1 : x = 1 ; x + y = 2 => y = 1

TH2 : x = -1 ; x + y = -2 => y = -3

TH3 : x = 2 ; x + y = 1 => y = -1

TH4 : x = -2 ; x + y = -1 => y = 1