Question

ajudem a montar essa conta ???

Answer 1

$\left \{ {{x+y=20} \atop {x=6y}} \right. \\\\5y+y=20\\6y=20\\y=20/6\\\\x=5(20/6)\\x=100/6$

Answer 2

Resolução:

$\left \{ {{x+y=20} \atop {x=5y}} \right.$

$5y+y=20 \\ \\  6y=20\\ \\  y= \frac{20}{6} \\ \\  x=5y\\ \\  x=5.\frac{20}{6} \\ \\  x=\frac{100}{6}$