resolva utilizando o escalonamento,os seguintes sistemas:?

resolva utilizando o escalonamento,os seguintes sistemas:

a)

x+y=10

x-y=4

2x-5y=-1

b)

-x+3y-z=1

x+y+z=-1

c)

a+b=3

a-b=1

3a+7b=11

d)

x-2y=8

3x-y=9

x+y=1

5x+7y=-10

e)

x+2y=11

x+3y=16

2x+5y=27

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