Question

2a + n = 39

a + 3n = 47 ​

Answer 1

Respuesta:

a = 14

n = 11

Explicación paso a paso:

2a + n = 39

a + 3n = 47

depejamos "a"

a = (39 -n)/2

a = 47 - 3n

igualamos

(39 - n)/2 = 47 - 3n

39 - n = (47 - 3n)2

39 - n = 94 - 6n

5n = 55

n = 11

reemplazamos

a = 47 - 3n

a = 47 - 3(11)

a = 47 - 33

a = 14

Answer 2

Respuesta:

2a+n=39 (×-3)

a+3n=47

_________

-6a-3n=-117

a+3n=47

__________

-5a= -70

a=-70/-5

a= 14

2a+n=39

2(14)+n=39

28+n=39

n=39-28

n=11