Question

determine a solução de cada um dos seguintes sistemas de equações do 1° grau nas incógnitas x e y:


a) x+y=22
x-y=8

b) 2x+y=26
x-y=4

c) 3x+y=-5
5x-2y=-1

d) x+2y=-4
3x-2y=20​

Answer 1

Answer:

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Step-by-step explanation:

Answer 2

Answer:

Step-by-step explanation:

a) x +y = 22

x = 22 -y

x - y=8

1 (22 - y) + y = 8

22 - y + y = 8

y =8,-22

y = -14

2y =14/ 2

y = 7

x=22 -y

x = 22-7

x=15

(15,7)

b)2x =26- y

26 - y - y= 4

-2y = 4 - 26

-2y =-18.(-1)

y =18

y =18/2

y = 6

2x =26 -6

x = 20 / 10

x = 10

c) 3x + y = 5

y= - 3x - 5

5x - 2.(-3x - 5 ) = - 1

5x + 6x + 10= - 1

11x = - 1 -10

11x = - 11

x = - 11/11

x = -1

y = -3 .-1 -5

y = +3 - 5

y = -2

d)x + 2y = - 4

x = - 4 - 2y

3.(- 2y - 4y) + 2y = 20

- 6y - 12 - 2y = 20

- 8y = 20 + 12

- 8y = 32

y = 32/8

y = 4

x = - 2.4 - 4

x = - 8 - 4

x = - 12