Question

Resolva o sistema
X+Y=1
4X+3y=0

Answer 1

{x+y=1 (-4)
{4x+3y=0
-------------
-4x-4y=-4
4x+3y=0
-----------
-y=-4 (-1)
y=4

x+y=1
x=1-y
x=1-4
x=-3

S={-3,4}

bons estudos

Answer 2

Olá,

x+y = 1 ⇒ x = 1-y
4x+3y = 0

4(1-y)+3y = 0
4-4y+3y = 0
4-y = 0
y = 4

x = 1-y
x = 1-4
x = -3

Resposta:

(x,y) = (-3,4)