Problem
8. Evaluate $10.2 x+9.4 y$ when $x=2$ and $y=3$. \[ \begin{array}{l} 10.2(\square+9.4( \\ =\square+28.2 \\ =\square \square \end{array} \]
Solution
Step 1 ：Given the expression \(10.2x + 9.4y\), we are asked to evaluate it when \(x=2\) and \(y=3\).
Step 2 ：Substitute \(x=2\) and \(y=3\) into the expression, we get \(10.2*2 + 9.4*3\).
Step 3 ：Perform the multiplication first according to the order of operations, we get \(20.4 + 28.2\).
Step 4 ：Finally, add the two numbers together to get the final result.
Step 5 ：The final answer is \(\boxed{48.6}\).
