Question

Answer 1

\(-\dfrac{5}{x}=-\dfrac{18}{72}\\ \Leftrightarrow-18x=-360\\ \Leftrightarrow x=20\\ \dfrac{-5}{20}=\dfrac{y}{16}\\ \Leftrightarrow\dfrac{-1}{4}=\dfrac{y}{16}\\ \Leftrightarrow4y=-16\\ \Leftrightarrow y=-4\)

Answer 2

\(\dfrac{-5}{x}=\dfrac{-18}{72}\)

\(\Rightarrow x.\left(-18\right)=\left(-5\right).72\)

\(x.\left(-18\right)=-360\)

\(x=\dfrac{-360}{-18}\)

\(x=20\)

\(\dfrac{y}{16}=\dfrac{-18}{72}\)

\(\Rightarrow y.72=\left(-18\right).16\)

\(y.72=-288\)

\(y=\dfrac{-288}{72}\)

\(y=-4\)

Vậy \(x=20;y=-4\)