To find the temperature at Station A after 6 hours, we need to substitute \( x = 6 \) into the expression for the temperature at Station A, which is given as:
\[ -8 + 3x \]
Substituting \( x = 6 \):
\[ -8 + 3 \cdot 6 = -8 + 18 \]
Now, simplifying this:
\[ -8 + 18 = 10 \]
Therefore, the temperature at Station A after 6 hours will be 10 degrees.