Tìm 2 số x,y biết:

Question

5x=8y; 2x-y=10

Answer 1

\(2x-y=10\Rightarrow y=2x-10 \)

Ta có: \(5x=8y\Leftrightarrow 5x=8(2x-10)\Leftrightarrow11x=80\)

Vậy \(x=\frac{80}{11} \Rightarrow y=2.\frac{80}{11}-10=\frac{50}{11}\)