Question

$\left \{ {{3x-(9x+y)=5y-(2x+9y) \atop {4x-(3y+7)=5y-47}} \right. \\\\\left \{ {{5(x+3y) - (7x + 8y) = -6} \atop {7x - 9y -2(x - 18y) = 0}} \right.$

Answer 1

Respuesta:

3x - 9x + y = 5y - 2x + 9y

- 6x - 2x + 2x = 5y + 9y - y

- 6x = 13y

4x - 3y - 7 = 5y - 47

4x - 3y - 5y = - 47 + 7

4x - 8y = - 40

- 6x + 4x - 8y + 13y = - 40

- 2x + 5y = - 40

y = 40 / - 5

y = - 8

-  2x = - 40 + 8

- 2x = - 32

x = 16

- 32 - 8 = 40

5x + 15y - 7x - 8y = - 6

-2x + 7y = - 6

7x - 9y - 2x + 36y = 0

5x + 27y = 0

Tenemos este sistema :

- 2x + 7y = - 6

5x + 27y = 0

5 ( 6 - 7y ) = - 2 ( 0 - 27y )

30 - 35y = 0 + 27y

- 35y - 27y = - 30

- 62y = - 30

y = - 30 / - 62

y = 0.48387

1ra e : - 2x = - 6 - 0.48387

- 2x = - 6.48387

x = - 6.48387/ - 2

x = 3.24193

- 6.48387 - 0.48387 = 6

2da e : 5x = 0 - 0.48387

5x = - 0.48387

x = - 0.48387 / 5

x = - 0.09677

- - 0.48387 + 0.48387 = 0

Explicación paso a paso: