\(\frac{3}{x}=\frac{-y}{5}=\frac{-15}{20}=\frac{-3}{4}\)
Đặt \(\frac{3}{x}=\frac{-3}{4}\)\(\Rightarrow-3x=12\)\(\Rightarrow x=-4\)
Đặt \(\frac{-y}{5}=\frac{-15}{20}\)\(\Rightarrow-20y=-75\)\(\Rightarrow y=\frac{-75}{-20}=\frac{15}{4}\)
Vậy x = -4 ; y = \(\frac{15}{4}\)
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