Question

1.) Resolva o sistema de equação do 1 grau

5x-8y=4

-5x+10y=0​

pofavor coloca com a conta armada pofavor

Answer 1

Resposta:

a)

5x - 8y = 4

- 5x + 10y = 0

5x = 4 + 8y

x = 4 + 8y

5

- 5x + 10y = 0

10y = 5x

10y = 5.(4 + 8y)

5

10y = 4 + 8y

10y - 8y = 4

2y = 4

y = 4/2

y = 2

- 5x + 10y = 0

10y = 5x

10.2 = 5x

20 = 5x

5x = 20

x = 20/5

x = 4

Resp.: x = 4 e y = 2

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b)

- 6x + 2y = 4

4x + y = - 5

4x + y = - 5

y = - 5 - 4x

- 6x + 2y = 4

- 6x + 2.(- 5 - 4x) = 4

- 6x - 10 - 8x = 4

- 14x = 4 + 10

- 14x = 14 ( - 1)

14x = - 14

x = -14/14

x = - 1

y = - 5 - 4x

y = - 5 - 4.(-1)

y = - 5 + 4

y = - 1

Resp.: x = - 1 e y = - 1