Question

resolva o sistema {-5x+y=-4 {+2x-y=-5

Answer 1

{-5x + y = -4
{2x - y = -5
===========
-3x = -9
x = -9/-3
x = 3

-5x + y = -4
-5.3 + y = -4
-15 + y = -4
y = -4 + 15
y = 11


S={ 3, 11 }




★Espero ter ajudado!