Question

resolvam esse sistema por favor
5=a+b
-5=-3a+b​

Answer 1

Resposta:

a+b=5 x(-1)

-3a+b=-5

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-a-b= -5

-3a+b=-5

-4a=-10

a= -10/-4

a= 5/2

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5/2+b= 5

5+2b= 10

2b= 10-5

2b= 5

b=5/2

S={(5/2,5/2)}