Question

2×-5y=8. x+5y=-2
$2x = 5y = 8$
​

Answer 1

Resposta:

x = 3/2

Explicação passo-a-passo:

2x - y = 2 . (2)

2x + 2y = 5

4x - 2y = 4

2x + 2y = 5

__________

6× = 9

x = 9/6

x = 3/2

Answer 2

Resposta:

Explicação passo a passo:

A)

2× - 5y = 8

x + 5y = - 2 (+)

------------------

3x = 6

x = 6/3

X = 2

x + 5y = - 2

2 + 5y = - 2

5y = - 2 - 2

5y = - 4

y = - 4/5

R.:

X = 2

Y = - 4/5

____________

B)

2x - y = 2 (2)

2x + 2y = 5

4x - 2y = 4

2x + 2y = 5 (+)

-----------------------

6x = 9 (:3)

2x = 3

X = 3/2

2x - y = 2

2.3/2 - y = 2

3 - y = 2

3 - 2 = y

y = 1

R.:

X= 3/2

y = 1