Question

Resolva o sistema linear:
X-Y = 5
2x-2y = 10

Answer 1

Resposta:

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{x - y = 5 ×(-2)

{2x - 2y = 10

...................................

{-2x + 2y = - 10

+ { 2x - 2y = 10

______________

0x = 0

x = 0

______________

-2.(0) + 2y = - 10

2y = - 10

y = - 10/2

y = - 5