To find the value of \( y \) using the expression \( y = x + 23 \), we can substitute the given values of \( x \) into the expression.
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For \( x = 15 \): \[ y = 15 + 23 = 38 \]
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For \( x = 20 \): \[ y = 20 + 23 = 43 \]
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For \( x = 25 \): \[ y = 25 + 23 = 48 \]
Now we can complete the table:
\[ \begin{array}{|c|c|} \hline x & y \ \hline 15 & 38 \ 20 & 43 \ 25 & 48 \ \hline \end{array} \]