Question

caucule X e Y na proporçao x/7=y/2,sabendo que x+y=15

Answer 1

x/7 =y/2 
x + y = 15
aplicando as Propriedades temos
( x + y)/( 7 + 2) = x/7 = y/2
15/9 = x/7 = y/2
15/9 = x/7
9x = 105
x = 105/9  *****

15/9 = y/2
9y = 30
y = 30/9 *****

PROVA
105/9 + 30/9 =135/9 = 15 CONFERE