Question

me ajuda por favor me ajuda por favor​

Answer 1

Explicação passo a passo:

$1)\\ {x\over y}={3\over4}~~~\to x+y=35\\ \\{x+y\over3+4}={35\over7}=5\\ \\ {x\over2}=5~~~~~~~~~~~~ {y\over4}=5\\\\ x=2\times5~~~~~~~~y=4\times5\\ \\ \boxed{x=10}~~~~~~~~~~~\boxed{y=20}$

---------------------------------------

2)

${x\over y}={6\over3}~~~\to~x+y=72\\ \\ {x+y\over6+3}={72\over9}=8\\ \\ {x\over6}=8~~~~~~~~~~~~~~~~{y\over3}=8\\ \\ x=6\times8~~~~~~~~~~~y=3\times8\\ \\ \boxed{x=48}~~~~~~~~~~~~~~\boxed{y=24}$

------------------------------------------------

3)

${x\over y}={7\over2}~~\to x-y=30\\ \\ {x-y\over7-2}={30\over5}=6\\ \\ {x\over7}=6~~~~~~~~~~~~~~~{y\over2}=6\\ \\ x=7\times6~~~~~~~~~~~y=2\times6\\ \\ \boxed{x=42}~~~~~~~~~~~~~~\boxed{y=12}$

--------------------------------------------

4)

${x\over y}={4\over3}~~~\to x-y=30\\ \\ {x-y\over4-3}={30\over1}=30\\ \\ {x\over4}=30~~~~~~~~~~~~~~~~~~~~ {y\over3}=30\\ \\ x=4\times30~~~~~~~~~~~~~~~y=3\times30\\ \\ \boxed{x=120}~~~~~~~~~~~~~~~~~~~\boxed{y=90}$