Question

d) 6x – 4 = 28 + 4x

e) 8 ( 3y – 2 ) + 20 = 5 ( 4y + 8)


f) 3.(3x – 1) = 2.(3x + 6)

g) 4.(x – 1) = 8 – 4.(2x – 3)

h) 7.(x – 2) = 5.(x + 4)

Answer 1

Resposta:

d) x = 16

e) y = 9

f) x = 5

g) x = 2

h) x = 17

Explicação passo-a-passo:

d) 6x – 4 = 28 + 4x

6x - 4 - 4x = 28

6x - 4x = 28+ 4

2x = 28+4

2x = 32

x = 32/2

x = 16

e) 8 ( 3y – 2 ) + 20 = 5 ( 4y + 8)

24y - 16 + 20 = 5 (4y + 8)

24y - 16 + 20 = 20y + 40

24y + 4 = 20y + 40

24y + 4 -20y = 40

24y - 20y = 40 - 4

4y = 40 - 4

4y = 36

y = 36/4

y = 9

f) 3.(3x – 1) = 2.(3x + 6)

9x - 3 = 2(3x + 6)

9x - 3 = 6x +12

9x - 6x = 12 + 3

3x = 15

x = 15/3

x = 5

g) 4.(x – 1) = 8 – 4.(2x – 3)

4x - 4 = 8 - 8x +12

4x - 4 = 20 - 8x

4x + 8x = 20 + 4

12x = 24

x = 24/12

x = 2

h) 7.(x – 2) = 5.(x + 4)

7x - 14 = 5x + 20

7x - 5x = 20 + 14

2x = 34

x = 34/2

x = 17