Question

preciso terminar isso hj msm

Answer 1

1)

$\frac{15}{5} = \frac{20}{x} \\ 15x = 100 \\ x = \frac{100}{15 } \\ x = 6.66$

2)

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