Question

Resolva os sistemas
2x+y= -7
x+2y=1

2x+y=18
x-y=3

Answer 1

Resposta:

{2x+y=-7 x(-2)

{x+2y=1

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-4x-2y=14

x+2y=1

-3x=15

x=-15/3=-5

-5+2y=1

2y=1+5

y=6/2=3

S={(-5,3)}

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{2x+y=18

x-y=3

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3x=21

x=21/3=7

7-y=3

-y=3-7

-y=-4

y=4

S={(7,4)}

Explicação passo-a-passo: