efeliciano2702 efeliciano2702
  • 23-06-2021
  • Mathematics
contestada

-6x + 7y = 9
2x - 2y = 4
Solve for x and y

Respuesta :

thewhitebloodcell
thewhitebloodcell thewhitebloodcell
  • 23-06-2021

Answer:

x = 23 , y = 21

Step-by-step explanation:

-6x + 7y = 9 -- (1)

2x - 2y = 4 -- (2)

(2) x 3 : 6x - 6y = 12 -- (2)'

(1) + (2)' : y = 21 -- (3)

Subtituting (3) into (2),

2x - 42 = 4

2x = 46

x = 23 -- (4)

According (3) and (4),

x = 23 , y = 21

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