Question

2. Resolva as equações, aplicando a regra prática:

a) 5x + 5 = 17 f) 4x – 10 = 2x + 2

b) 6x = 2x + 16 g) 2x + 1 = 4x + 9

c) 3x + 1 = 2x h) 7(x – 1) – 2(x – 5) = x - 5

d) 4.(x – 3)+ 5 =39 i) x + 5,47 = 3,57

e) x – 7 + 9 = 12 j) x + x – 4 = 17 – 2x + 4​

Answer 1

Resposta:

a) 2,4

b) 4

c) -1

d) 11,5

e) 10

f) 6

g) -4

h) 3

i) -1,9

j) 6,25

Explicação passo-a-passo:

a) 5x + 5 = 17

5x = 17 - 5

5x = 12

x = 12/ 5

x = 2,4

b) 6x = 2x + 16

6x - 2x = 16

4x = 16

x = 16/ 4

x = 4

c) 3x + 1 = 2x

3x - 2x = -1

x = -1

d) 4.(x - 3) + 5 = 39

4x - 12 + 5 = 39

4x = 39 + 12 - 5

4x = 46

x = 46/ 4

x = 11,5

e) x - 7 + 9 = 12

x = 12 + 7 - 9

x = 10

f) 4x - 10 = 2x + 2

4x - 2x = 2 + 10

2x = 12

x = 12/ 2

x = 6

g) 2x + 1 = 4x + 9

2x - 4x = 9 - 1

- 2x = 8 (-1)

2x = - 8

x = -8/ 2

x = - 4

h) 7. (x - 1) - 2. (x - 5) = x - 5

7x - 7 - 2x - 10 = x - 5

7x - 2x - x = - 5 + 7 + 10

4x = 12

x = 12/ 4

x = 3

i) x + 5,47 = 3,57

x = 3,57 - 5,47

x = - 1,9

j) x + x - 4 = 17 - 2x + 4

x + x + 2x = 17 + 4 + 4

4x = 25

x = 25/ 4

x = 6,25

Espero ter ajudado!