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 )}

135 is your answer

step-by-step explanation:

try 180 times three then divide that number by 4 (sides) to get your answer. im glad to : )

the one that has a slope of 1/2 and is positive.

step-by-step explanation: 2 buckets 1 trip ; 4 buckets 2 trips and so on.