Question

calcule X e Y na proporção x/2 = y/3 ,sabendo que x+y=15

Answer 1

$\left \{ {{ \frac{y}{3} = \frac{x}{2}} \atop {x+y=15}} \right. \\ \\ \left \{ {{y= \frac{3x}{2}} \atop {x+y=15}} \right. \\ \\ x+ \frac{3x}{2} = 15 \\ \\ \frac{2x+3x}{2} = 15 \\ \\ 5x = 30 \\ \\ x = \frac{30}{5} \\ \\ x = 6$