Question

determine o valor x e y na proporção.

$\frac{x}{y} \frac{3}{4}$
Sabendo x+y=35. os valores x e y são respectivamente


​

Answer 1

Resposta:

$x = 15\\y = 20$

Explicação passo-a-passo:

Suponho que seja,

$\frac{x}{y} = \frac{3}{4}\\\\como,\\x + y = 35\\x = 35 - y\\\\temos,\\\\\frac{35 - y}{y} = \frac{3}{4}\\\\35 - y = \frac{3}{4}y\\\\35 = \frac{3y}{4} + y\\\\35 = \frac{3y}{4} + \frac{4y}{4}\\\\35 = \frac{3y + 4y}{4}\\\\35 = \frac{7y}{4}\\\\35*4 = 7y\\\\140 = 7y\\\\y = \frac{140}{7}\\\\y = 20\\\\logo,\\\\x = 35 - y\\x = 35 - 20\\x = 15$