To find the value of \( y \) when \( x = -10 \), we can use the equation \( y = x - 7 \).
Substituting \( x = -10 \) into the equation:
\[ y = -10 - 7 \]
Now, calculate:
\[ y = -17 \]
Thus, when \( x = -10 \), the value of \( y \) is
\[ y = -17 \]