Question

2)resolva, sendo u = q: a)5x+1=36 b)2x-8=8 c)3x+1=19 d)7x+1-5x=9 e)7y-4=10 f)9x-7=5x+13 g)16-x=x+25 h)2.(2x-1)-6.(1-2x)=2.(4x-5)

Answer 1

Resposta:

Vamos lá...

a) 5x + 1 = 36

5x = 36 - 1

5x = 35

x = 35/5

x = 7

b) 2x - 8 = 8

2x = 8 + 8

2x = 16

x = 16/2

x = 8

c) 3x + 1 = 19

3x = 19 - 1

3x = 18

x = 18/3

x = 6

d) 7y - 4 = 10

7y = 10 + 4

7y = 14

y = 14/7

y = 2

e) 7x + 1 - 5x = 9

2x =9 - 1

2x = 8

x = 8/2

x = 4

f) 16 - x = x + 25

- x - x = 25 - 16

- 2x = 9 →(× por -1)

2x = - 9

x = - 9/2

g) 9x - 7 = 5x + 13

9x - 5x = 13 + 7

4x = 20

x = 20/4

x = 5

h) 2.(2x - 1) - 6.(1 - 2x) = 2.(4x -5)

4x - 2 - 6 + 12x = 8x - 10

4x + 12x - 8x = - 10 + 6 + 2

8x = - 2

x = - 2/8 ÷ 2

x = - 1/4

Espero ter ajudado.

Bons estudos.