Question

r=-(-3s)-1/4 r+3s=20​

Answer 1

Respuesta:

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Explicación paso a paso:

r = 3s - 1/4

r+3s = 20 ⇒  r = -3s +20

si sumamos las dos igualdades de r nos queda así:

r =  3s - 1/4

r = -3s + 20

2r = 0s + (20 - 1/4)

2r = (80/4) - (1/4)

2r = 79/4

r = (79/4) / 2

r = 79 / (4*2)

r = 79/8

r + 3s = 20

79/8 + 3s = 20

3s = 20 - 79/8

3s = (160/8) - (79/8)

3s = 81/8

s = (81/8) / 3

s = 81 / (8*3)

s = 81/24

s = 27/8

Comprobación:

r = 3s - 1/4

79/8 = (3*27/8) - 1/4

79/8 = 81/8 - (2/8)  

Respuesta:

r = 79/8

s = 27/8