Question

O resultado de “x” na equação 4/(5x + 1) = 9/(10x + 6) é:

Group of answer choices

1

2

3

0

Answer 1

$\frac{4}{(5x + 1)} = \frac{9}{(10x + 6)} \\ multiplique \: em \: cruz \\ 9(5x + 1) = 4(10x + 6) \\ 45x + 9 = 40x + 24 \\ 45x - 40x = 24 - 9 \\ 5x = 15 \\ x = \frac{15}{5} = 3$

portanto, x=3