Question

me ajudem por favor

a- x/6=7/5

b-3x/5=2/7

c-2/1=15-x/x

d-6/10=x/x+2

Answer 1

$a) \frac{x}{6} = \frac{7}{5} \\ 5x = 6 \times 7 \\ 5x = 42 \\ x = \frac{42}{5}$
$b) \frac{3x}{5} = \frac{2}{7} \\ 7 \times 3x = 5 \times 2 \\ 21x = 10 \\ x = \frac{10}{21}$
$c) \frac{2}{1} = \frac{15 - x}{x} \\2 \times x = 1 \times (15 - x) \\ 2x = 15 - x \\ 2x + x = 15 \\ 3x = 15 \\ x = \frac{15}{3} \\ x = 5$
$d) \frac{6}{10} = \frac{x}{x + 2} \\ 10 \times x = 6(x + 2) \\ 10x = 6x + 12 \\ 10x - 6x = 12 \\ 2x = 12 \\ x = \frac{12}{2} \\ x = 6$