Question

4. Resolver:
(x + 2y = 13
3x - y = 11
Indicar: "x + y"
c) 7
a) 9
d) 6
b) 8
e) 5​

Answer 1

x+2y=13
x=13-2y
3(13-2y)-y=11
39-6y-y=11
39-5y=11
-5y=11-39
-5y=-28
y=(-28)/(-5)
y=5.6
x+2(5.6)=13
x+11.2=13
x=13-11.2
x=1.8

x=1.8
y=5.6

Espero te sirva :)

Answer 2

Respuesta:

x+2y=13

3x-y=11 => (3x-y)2=(11)2 => 6x-2y=22

[x+2y=13       |(+)    

[6x-2y=22

7x=35

x=5

y=4

Explicación paso a paso:

5+4=9

a)