\[\frac{x + 2y}{y} = 5\]
\[\frac{x}{y} + \frac{2y}{y} = 5\]
\[\frac{x}{y} + 2 = 5\]
\[\frac{x}{y} = 5 - 2 = 3.\]
\[\frac{3x + y}{y} = \frac{3x}{y} + \frac{y}{y} = 3 \cdot \frac{x}{y} + 1 =\]
\[= 3 \cdot 3 + 1 = 10.\]