jmasa2001 jmasa2001

12-09-2020
Mathematics

contestada

solve using elimination method

-3x + 5y = 8
-2x + 7 y = -2

Respuesta :

Аноним Аноним

12-09-2020

Answer:

x = - 6

y = - 2

Step-by-step explanation:

-3x + 5y = 8 | ×(-2)

-2x + 7 y = -2 | ×3

6x - 10y = - 16

- 6x + 21y = - 6

add

6x - 6x - 10y + 21y = - 16 - 6

11y = - 22

y = - 22 : 11

y = - 2

replace y

- 2x + 7(-2) = - 2

- 2x - 14 = - 2

- 14 + 2 = 2x

2x = - 12

x = - 12 : 2

x = - 6

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