Ta có: \(\frac{1+4y}{13}=\frac{1+6y}{19}\)
\(\Leftrightarrow19\left(1+4y\right)=13\left(1+6y\right)\)
\(\Leftrightarrow19+76y=13+78y\)
\(\Leftrightarrow76y-78y=13-19\)
\(\Leftrightarrow-2y=-6\)
\(\Leftrightarrow y=3\)
Lại có: \(\frac{1+6y}{19}=\frac{1+8y}{5x}\)
\(\Leftrightarrow\frac{1+6.3}{19}=\frac{1+8.3}{5x}\)
\(\Leftrightarrow\frac{19}{19}=\frac{25}{5x}\)
\(\Leftrightarrow5x=\frac{25.19}{19}=25\)
\(\Leftrightarrow x=5\)
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