Question

resolva o sistema preciso de calculos
x+5y=11
3x-y=1
entao x+yé

a)1
b)2
c)3
d)4

Answer 1

x+5y=11 (-3)
3x-y=1

-3x-15y=-33
 3x-y=1

-16y=-32 (-1)
 16y=32
   y=2

3x-2=1
3x=1+2
3x=3
 x=1

2+1=3

Letra C

Answer 2

{x+5y=11
{3x-y=1
x=11-5y
3(11-5y)-y=1
33-15y-y=1
-15-y=1-33
-16y=-32.(-1)
16y=32
y=32/16
y=2
x=11-5y
x=11-5.2
x=11-10
x=1
x+y=1+2=3
Letra C