Question

Com a, b e c paralelas, qual o valor de x?*



9

12

6

18​

Answer 1

$\frac{2x - 2}{3x + 1} = \frac{4}{7} \\ 7.(2x - 2) =4.( 3x + 1) \\ 14x - 14 = 12x + 4 \\ 14x - 12x = 4 + 14 \\ 2x = 18 \\ x = \frac{18}{2} \\ x = 9$

Letra A)