Question

qual o valor de x e y??

Answer 1

$\large\boxed{\begin{array}{l}\sf 30-12=18\\\sf y=35-x\\\sf\dfrac{12}{18}=\dfrac{x}{35-x}\\\\\sf 18x=420-12x\\\sf 18x+12x=420\\\sf 30x=420\\\sf x=\dfrac{420}{30}\\\\\sf x=14\\\sf y=35-x\\\sf y=35-14\\\sf y=21\end{array}}$