`color{#8FBC8F}{~} color{#C1FFC1}{b} color{#B4EEB4}{u} color{#9BCD9B}{i} color{#698B69}{g} color{#2E8B57}{i} color{#54FF9F}{a} color{#4EEE94}{p} color{#43CD80}{h} color{#98FB98}{o} color{#008B45}{n} color{#00FF00}{g} color{#00EE00}{9} color{#00CD00}{9} color{#ADFF2F}{9} color{#228B22}{~}`

Áp dụng tính chất dãy tỉ số bằng nhau, ta có:

`(3x)/5=y/4=(3x-y)/(5-4)=5/1=5`

`=> (3x)/5=5=>3x=5.5=25=>x=25/3`

`=> y/4=5=>y=4.5=20`

Vậy `(x;y)=(25/3;20)`