Question

determine o valor de x:​

Answer 1

Usando o Teorema de Tales, temos:

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