Question

12x + y = 26
b) (x - y = 4​

Answer 1

Resposta:

a) {x+y=20

{x-y=8

{ x = 20

{ x = 8

-------------- soma

2x = 28

x = 28 / 2

x = 14

x + y = 20

14 + y = 20

y = 20 - 14

y = 6

*******************************************

b) {x+2y=5

{3x-2y= -25

{ x = 5

{ 3x = - 25

------------------- soma

4x = -20

x = -20/4

x = -5

x + 2y = 5

-5 + 2y = 5

2y = 5 + 5

2y = 10

y = 10/2

y = 5

*********************************************

c) {x+4y=-1 (-1)

{x-15y= -20

{ -x - 4y = 1

{ x - 15y = -20

{ -4y = 1

{ -15y = -20

------------------ soma

-19y = -19 (-1)

y = 19/19

y = 1

x + 4y = -1

x + 4.1 = -1

x + 4 = -1

x = -1 -4

x = -5

************************************************

d) {2x-3y=26 ( 3 )

{3x+2y=19 ( - 2 )

{ 6x - 9y = 78

{ -6x - 4y = -38

{ - 9y = 78

{ - 4y = -38

---------------- soma

- 13y = 40 (-1)

y = -40/13

2x - 3.(-40/13) = 26

2x + 120/13 = 26

2x = 26/1(×13) - 120/13

2x = 338/13 - 120/13

2x = 218/13

x = 218/13/2

x = 218/13 × 1/2

x = 218 / 26

Explicação passo-a-passo:

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