Question

8 - Determine o valor de :
a) 6x = 2x + 16
b) 2x - 5 = x + 1
c) 2x + 3 = x + 4
d) 5x + 7 = 4x + 10
e) 4x - 10 = 2x + 2
1) 4x - 7 = 8x - 2
g) 2x + 1 = 4x - 7
h) 9x + 9 + 3x = 15​

Answer 1

a) 6x = 2x + 16

6x - 2x = 16

4x = 16

x = 16

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4

x = 4

b) 2x - 5 = x + 1

2x - x = 1 + 5

x = 6

c) 2x + 3 = x + 4

2x - x = 4 - 3

x = 1

d) 5x + 7 = 4x + 10

5x - 4x = 10 - 7

x = 3

e) 4x - 10 = 2x + 2

4x - 2x = 2 + 10

2x = 12

x = 12

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2

x = 6

f) 4x - 7 = 8x - 2

4x - 8x = - 2 + 7

- 4x = 5 . (-1)

4x = - 5

x = - 5

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4

g) 2x + 1 = 4x - 7

2x - 4x = - 7 - 1

- 2x = - 8 . (-1)

2x = 8

x = 8

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2

x = 4

h) 9x + 9 + 3x = 15

9x + 3x = 15 - 9

12x = 6

x = 6 (÷6)

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12 (÷6)

x = 1

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2

Answer 2

Resposta:

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