Question

calcule os valores de x e y,sabendo que:​

Answer 1

a)

(x+y=18 (x=18-y

(x/y=4/5 ((18-y)/y=4/5

(----------- (------------

(5(18-y)=4y (90-5y=4y

(--------- (x=18-10

(90=5y+4y (10=y

(x=8

(y=10

b)

(x/y=4/3 ((30+y)/y=4/3

(x-y=30 (x=30+y

(3(30+y)=4y (90+3y=4y

(-------------- (----------

(90=4y-3y (90=y

(----------- (x=30+90

(y=90

(x=120