Question

$\left \{ {{y=x+5} \atop {x+y=1}} \right.$

Answer 1

y = x + 5 (I)
x+y = 1    (II)

Substituir I em II:
X + Y = 1
x + (x+5) = 1
2x + 5 = 1
2x = 1 - 5
2x = - 4
x = -2

y = x + 5
y = -2 + 5
y = 3

x = -2, y = 3
(2,3)