Respuesta :

Answer:

Step-by-step explanation:

x = - 2y

x - y = 9

You can get y pretty quickly by substituting x from the first equation into the second equation

-2y -y = 9             Combine

-3y = 9                 Divide by - 3

-3y/-3 = 9/-3

y = - 3

Now Substitute -3 for y in the top equation

x = - 2(-3)

x = 6                     Remember 2 minus' make a plus.

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