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To evaluate the expression \( \frac{y \cdot 5}{y + 2} \) when \( y = 8 \), follow these steps:
1. Substitute \( y = 8 \) into the expression:
\[ \frac{8 \cdot 5}{8 + 2} \]
2. Simplify the numerator and the denominator:
\[ \frac{40}{10} \]
3. Divide the numerator by the denominator:
\[ 40 \div 10 = 4 \]
So, the value of the expression when \( y = 8 \) is \( 4 \).