To find the \( y \) value given the line of best fit, you can use the equation of the line:
\[ y = -53x + 5,339 \]
Where \( x \) is the average temperature. In this case, \( x = 42 \) degrees.
Now, substituting \( x = 42 \) into the equation:
\[ y = -53(42) + 5,339 \]
Calculating \( -53(42) \):
\[ -53 \times 42 = -2,226 \]
Now substituting that back into the equation:
\[ y = -2,226 + 5,339 \]
Calculating \( -2,226 + 5,339 \):
\[ y = 3,113 \]
Thus, the \( y \) value is:
\[ \boxed{3,113} \]