Question

determine o valor de x nas proporcoes pfvrrr 15 pontos​

Answer 1

a)

 $\frac{1}{7}=\frac{x-6}{49}\quad :\quad x=13\\\\\\\frac{1}{7}=\frac{x-6}{49}\\\\\\\frac{x-6}{49}=\frac{1}{7}\\\\\\\frac{49\left(x-6\right)}{49}=\frac{1\cdot \:49}{7}$

$x-6=7\\\\\\x-6+6=7+6\\\\x=13$

b)

)$\frac{10}{7}=\frac{50}{X}\quad :\quad X=35$

$\frac{10}{7}=\frac{50}{X}\\\\10X=7\cdot \:50\\\\10X=350\\\\\frac{10X}{10}=\frac{350}{10}\\\\X=35\\\\X=35$

c)

$\frac{5x+3}{10}=\frac{-21}{30}\quad :\quad x=-2\\\\\\\frac{5x+3}{10}=\frac{-21}{30}\\\\\\\frac{5x+3}{10}\cdot \:10=\frac{-21}{30}\cdot \:10$

$5x+3=-7\\\\\\5x+3-3=-7-3\\\\\\5x=-10\\\\\\\frac{5x}{5}=\frac{-10}{5}\\\\\\x=-2$

Meu Amore Eu fiz Só Ate Á  ( c) tbm