Question

resolva o sistema {x+y=5
{x-y=1

Answer 1

Ola Marcele

x + y = 5
x - y = 1

some
2x = 6
x = 3

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

.

Answer 2

isolando o x > x=5-y
5-y-y=1
-2y+5-1=0
-2y+4=0
Delta= (-2²) -4*0*4
Delta= 4-4
delta=0
X= -(-2)+ou-0 / 2
X=4+ou-0/2
X=2, -2

logo >
Y=2
X=5-2  
X=3    


S=(3,2)