Question

{x y + 5 = 12 - x { x² - 1 = 0 ??

Answer 1

Oi Karol

sistema

xy + 5 = 12 - x
x² - 1 = 0

xy + x = 7
x*(y + 1) = 7

x² = 1
x = 1  , 1*(y + 1) = 7 , y = 6

x = -1,  -1*(y + 1) = 7, y = -8