Question

c)
(8x - y = 47
x+8y = 14
d) {10x-7y=26
8x + y = 34​

Answer 1

Respuesta:

Explicación:

1) 5x-y = 9 5x - 9 = y

2x+y = 12 y = 12 - 2x

5x - 9 = 12 - 2x

7x = 21

x= 3

y = 12 -2(3) = 6

y = 6

2) 4x+2y = 26 y = 13 - 2x

x+3y=14 y = 14 -x / 3

13 - 2x = 14 -x / 3

39 - 6x = 14 - x

25 = 5x

x= 5

y = 13- 2(5)= 3

y= 3

3) x+y = -8 y = -8 -x

x-y = -2 x-2 = y

-8 -x =x-2

-6 = 2x

x= -3

-3 +y = -8

y = -5

4) x+2y = 2 y = 2- x / 2

-2x+3y = 10 y = 10+ 2x / 3

2- x / 2 = 10+ 2x / 3

6 -3x = 20 + 4x

-7x = 14

x= -2

y = 10+ 2(-2) / 3

y = 2

5) x+3y = 5 y = 5 -x / 3

5x-4y = 6 y = 5x -6 / 4

5 -x / 3 = 5x -6 / 4

20 - 4x = 15x -18

38 = 19x

x= 2

y = 5- 2/3

y= 1