Question

gente me ajudem prfvrrr 15 pontos​

Answer 1

Resolver as equações e verificar

a)

$\sf x + 5 = 9$

$\sf x = 9 - 5$

$\red{\sf x = 4}$

Verificação:

=> x + 5 = 9

=> 4 + 5 = 9

=> 9 = 9 → Ok

====>>> x = 4 <<<====

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b)

$\sf x - 4 = 5$

$\sf x = 5 + 4$

$\red{\sf x = 9}$

Verificação:

=> x - 4 = 5

=> 9 - 4 = 5

=> 5 = 5 → Ok

====>>> x = 9 <<<====

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c)

$\sf 5z = - 30$

$\sf z = - \dfrac{30}{5}$

$\red{\sf z = - 6}$

Verificação:

=> 5z = - 30

=> 5*(-6) = - 30

=> - 30 = - 30 → Ok

====>>> x = - 6 <<<====

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d)

$\sf 4x - 2 = x + 10$

$\sf 4x - x = 10 + 2$

$\sf 3x = 12$

$\sf x = \dfrac{12}{3}$

$\red{\sf x = 4}$

Verificação:

=> 4x - 2 = x + 10

=> 4*4 - 2 = 4 + 10

=> 16 - 2 = 14

=> 14 = 14 → Ok

====>>> x = 4 <<<====

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