Resolver las siguientes ecuaciones lineales de 2x2, aplicando el método de sustitución:

a) x = 28

   y = 4

b)

Step-by-step explanation:

a) x- 5y = 8

-7 + 8y = 25

8x-40y = 64

-35 + 40y = 125

8x-35 = 189

8x = 189 + 35

8x = 224

x = 28

x-5y = 8

28-5y = 8

28-8 = 5y

20 = 5y

y = 4

b) Sistema de ecuaciones lineaes " 2 × 2 " : Metodo de sustitucion

1 → { 4x + 5y = 5

2 → { - 4x - 10y = - 7

Despejando la variable " y " de la ecuacion " 1 " :

4x + 5y = 5

5y = - 4x + 5

y = ( - 4x + 5 ) / 5

Reemplazamos en la ecuacion " 2 " :

- 4x - 10 ( - 4x + 5 ) / 5 = - 7

- 4x - 2 ( - 4x + 5 ) = - 7

- 4x + 8x - 10 = - 7

- 4x + 8x = - 7 + 10

4x = 3

x = 3/4

Reemplazamos en la ecuacion " 1 " de la variable despejada " y " :

y = ( - 4.(3/4) + 5 ) / 5

y = ( - 3 + 5 ) / 5

y = 2/5

Solución → S = {( 3/4 , 2/5 )}

the  office resources  are the human, physical and financial  resources  which are utilized for performing all the activities in order to achieve the organizational objectives.

happy to

pls mark as brainliest