Question

18)Na figura . Então, o valor de x é:

( ) 8 cm
( ) 5 cm ( )2 cm ( ) 2,5 cm ( )4,2 cm​

Answer 1

$\frac{3x + 1}{5x - 1} = \frac{4}{6} \\ (3x + 1) \times 6 = 4 \times (5x - 1) \\ 18x + 6 = 20x - 4 \\ 18x - 20x = (- 4) - 6 \\ - 2x = - 10 \: \: \: .( - 1) \\ 2x = 10 \\ x = \frac{10}{2} \\ x = 5$

X=5 cm