jaydabrock7 jaydabrock7

18-12-2019
Mathematics

contestada

solve by substitution
-4x+y=6
-5x-y=21

Respuesta :

Yang100 Yang100

18-12-2019

Answer:

x=-3, y=-6. (-3, -6).

Step-by-step explanation:

-4x+y=6

-5x-y=21

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

-9x=27

x=27/-9

x=-3

-5(-3)-y=21

15-y=21

y=15-21

y=-6

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