Question

RESOLVA OS SISTEMAS:


a) {3x-y=10

{x+2y=5


b) {x-y=9

{2x+y=6


c) {x=2y

{3x-6y=-6


d) {2x-2y=5

{x+y=0



ME AJUDEM POR FAVOR..

Answer 1

Resposta:

a)3x-y=10 x(2)

x+2y=5

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6x-2y=20

x+2y= 5

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7x= 25 //x=25/7

25/7+2y=5

25+14y=35//14y=35-25//y=10/14=5/7

b) x-y= 9

2x+y=6

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3x =15 // x=15/3=5

5-y= 9// -y= 9-5//-y=4//y=-4

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c) x=2y

3x-6y=-6

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3*2y-6y=-6

6y-6y= - 6

0y= -6 e impossível

d) 2x-2y=5

x+y=0 x(2)

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2x-2y=5

2x+2y=0

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4x = 5

x=5/4

x+y=0

5/4+y=0

y= -5/4

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