To find the temperature of the water after 6 minutes using the equation \( y = 10x + 20 \), we can substitute \( x = 6 \) into the equation:
\[ y = 10 \cdot 6 + 20 \]
Calculating this:
\[ y = 60 + 20 \] \[ y = 80 \]
So, the temperature of the water after 6 minutes is \( y = 80 \) degrees.