To determine the value of \( k \) in the function \( g(y) = y + k \) that describes the translation from the point \( (5, -3) \) to the point \( (5, 7) \), we can consider how the \( y \)-coordinate changes.
The original \( y \)-coordinate is \( -3 \), and it is translated to \( 7 \). We can express this translation mathematically:
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The change in the \( y \)-coordinate is:
\[ 7 - (-3) = 7 + 3 = 10 \] -
Thus, we need to add \( 10 \) to the original \( y \)-coordinate of \( -3 \) to reach \( 7 \). This means we have: \[ g(y) = y + 10 \]
From this, it follows that \( k = 10 \).
So, the value of \( k \) is \( \boxed{10} \).