Question

resolva os sistemasa)
{x – y =– 6 b) {2x – 5y = 0 c) {3x – 3y = 15
{x + y = 4 { x + 3y = 22 {2x + 2y = 6

Answer 1

Resposta:

Explicação passo a passo:

a)

{x – y = – 6

{x + y = 4 (+)

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"2x= -2"

"x= - 2/2"

"x= - 1"

"x+y= 4"

"-1+y=4"

"y= 1+4"

"y= 5"

___________

{ b)

) {2x – 5y = 0

{ { x + 3y = 22 (-2)

"2x-5y=0"

"-2x-6y= - 44(+)

-----------------------

-11y= - 44

"y= 4 "

"2x-5y= 0"

"2x=5y"

2x= 5.4

2x= 20

' x= 10'

_______________

c)

{3x – 3y = 15.(2)"

{2x + 2y = 6 .(3)"

'6x-6y= 30'

6x+6y= 18(+)

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"12x=48"

"x= 48/12"

"x= 4"

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"6x+6y= 18'

"6.4+6y= 18'

"24+6y= 18"

6y= 18-24

"6y= - 6'

"y = -6/6"

" y = -1"