Question

Me Ajudem Pvf

Obs:É Pra Entregar Amanhã.

Answer 1

Resposta:

A)(x, y) ( 3, 2)

B)(x, y) ( 1, 1)

C) (x, y) ( - 3/-2, - 5)

D)(x, y) ( 2, - 4)

E) (x, y) ( - 10, 27/4)

Explicação passo-a-passo:

A) X + y = 5

X - y = 1

_______

2x = 6

X = 6/2

X = 3

Y = 5 - x

Y = 5 - 3

Y = 2

B) x + y = 2

X - y = 0

__________

2x = 2

X = 2/2

X = 1

Y = 2 - x

Y = 2 - 1

Y = 1

C) 3x + y = 7. (-1)

X + y = 3

-3x - y = - 7

X + y = 4

__________

-2x = - 3

X = - 3/-2

- y = - 7 - 3x

-y = - 7 - 3.(-3/-2)

-y = - 7 +9/-2

-y = - 14 + 9

-y = - 5

D) X - y = - 6

X + y = 10

________

2x = 4

X = 4/2

X = 2

-y = - 6 +x

-y = - 6 +2

Y = - 4

E) x + 4y = 17 4y = 17 - x

X - y = - 3

X - (-17 - x )= - 3

X = + 17 + x = - 3

2x = - 3 - 17

X = - 20/2

X = - 10

4y = 17 - x

4y = 17 - (-10)

4y = 17 + 10

4y = 27

Y = 27/4