Question

resolva as seguintes proporções:​

Answer 1

Explicação passo-a-passo:

C)

$\dfrac{1}{7} = \dfrac{x - 6}{49}$

$49 = 7(x - 6)$

$49 = 7x - 42$

$- 7x = - 42 - 49$

$- 7x = - 91$

$x = \dfrac{ - 91}{ - 7}$

x=13

D)

$\dfrac{5x + 3}{10} = - \dfrac{21}{30}$

$3(5x + 3) = -21$

$15x + 9 = - 21$

$15x = - 21 - 9$

$15x = - 30$

$x = - \dfrac{ 30}{15}$

x=-2