Question

6) Determine o valor de x em cada uma das seguintes equações. a) x-1=9 b) 8x - 6 = 6x c) 5x = 10 e) 20 + 6x = -2x + 28 d) 5x-40 = 2-x g) 13x - 5 = 11 + 9x h) 9x - 14 = 7x + 20 j) 2x - 5 = x + 1 k) 8x - 4 = 12x - 20 f) 7x+15-5x - 10 = -17 + 13x i) 5-x-11 = 4x - 22
Me ajudem-me por favor​

Answer 1

Resposta:

a) x-1 = 9

x = 9 + 1

x= 10

b) 8x - 6 = 6x

8x -6x - 6 = 0

2x -6=0

2x=6

x=3

c) 5x = 10

x = 10/5

x=2

e) 20 + 6x = -2x + 28

6x + 2x = 28-20

8x=8

x=1

d) 5x-40 = 2-x

5x+x = 2 + 40

6x = 42

x=42/6

x=7

g) 13x - 5 = 11 + 9x

13x -9x = 11 + 5

4x = 16

x=16/4

x=4

h) 9x - 14 = 7x + 20

9x - 7x = 20 + 14

2x = 34

x=17

j) 2x - 5 = x + 1

2x - x = 1 + 5

x = 6

k) 8x - 4 = 12x - 20

8x - 12x = -20 + 4

-4x = -16

x= (-16)/(-4)

x=4

f) 7x+15-5x - 10 = -17 + 13x

2x + 5 = -17 + 13x

2x - 13x = -17 - 5

-11x = -22

x=2

i) 5-x-11 = 4x - 22

-x-6 = 4x -22

-5x = -22 + 6

-5x = -16

x= 16/5