ПРОШУ ПОМОГИТЕ С ПРЯМОЙ ПРОПОРЦИОНАЛЬНОСТЬЮ И ЛИНЕЙНОЙ ФУНКЦИЕЙ!!!! ДАЮ 15 БАЛЛОВ!!!!!!!

Решите задачу:

$\bf\displaystyle\left \{ {{y=1.5x} \atop {2y+2x=48}} \right.\implies \left \{ {{y=1.5x} \atop {2y=2(24-x)}} \right. \implies\left \{ {{y=1.5x} \atop {y=24-x}} \right. \implies\\\\\\1.5x=24-x\implies 1.5x + x = 24 \implies 2.5x=24\implies\\\\\\\implies x=\frac{24}{\frac{25}{10}}=\frac{24\cdot 10}{25}=\frac{48}{5}\implies y = 1.5\cdot \frac{48}{5}=\frac{15}{10}\cdot\frac{48}{10}=\frac{72}{5}\\\\\\\\(x;y)=(\frac{48}{5};\frac{72}{5})$