Question

giúp mình gấp nha :x phần y bằng 2 phần 5 và 2*x - 3*y=44

Answer 1

\(\dfrac{x}{y}=\dfrac{2}{5}\Rightarrow\dfrac{x}{2}=\dfrac{y}{5}\)

Áp dụng t/c dtsbn:

\(\dfrac{x}{2}=\dfrac{y}{5}=\dfrac{2x}{4}=\dfrac{3y}{15}=\dfrac{2x-3y}{4-15}=\dfrac{44}{-11}=-4\)

\(\Rightarrow\left\{{}\begin{matrix}x=\left(-4\right).2=-8\\y=\left(-4\right).5=-20\end{matrix}\right.\)

Answer 2

\(\dfrac{x}{y}=\dfrac{2}{5}\Rightarrow\dfrac{x}{2}=\dfrac{y}{5}\)

Áp dụng TCDTSBN ta có:

\(\dfrac{x}{2}=\dfrac{y}{5}=\dfrac{2x-3y}{4-15}=\dfrac{44}{-11}=-4\)

\(\dfrac{x}{2}=-4\Rightarrow x=-8\\ \dfrac{y}{5}=-4\Rightarrow y=-20\)