Question

Determine as raízes das equações do 1° grau
a) 9x = 27
b) - 5x = 15
c) x + 7 = 12
d) - x + 8 = 32
e) 9x + 3 = 4x - 12
f) - 3x + 8 = 2x - 2
g) 3(x - 4) - 2 = 5 (x + 1) + 1

Answer 1

a) 9x = 27

x = 27/9

x = 3

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b) - 5x = 15

x = 15/-5

x = - 3

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c) x + 7 = 12

x = 12 - 7

x = 5

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d) - x + 8 = 32

- x = 32 - 8

- x = 24

x = - 24

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e) 9x + 3 = 4x - 12

9x - 4x = - 12 - 3

5x = - 15

x = - 15/5

x = - 3

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f) - 3x + 8 = 2x - 2

- 3x - 2x = - 2 - 8

- 5x = - 10

x = -10/-5

x = 10/5

x = 2

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g) 3(x - 4) - 2 = 5 (x + 1) + 1

3x - 12 - 2 = 5x + 5 + 1

3x - 5x = 5 + 1 + 12 + 2

- 2x = 20

x = 20/-2

x = - 10