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The problem asks to evaluate the expression \(-3a + y\) when \(a = 4\) and \(y = -5\).

Let's compute this step by step:

\[
-3a + y = -3(4) + (-5) = -12 - 5 = -17
\]

So, the value of the expression is \(-17\).

Would you like more details on this process or have any questions?

Here are some related questions you can explore:
1. What happens if \(a\) and \(y\) are both negative?
2. How would the expression change if \(a = 0\)?
3. What is the result if \(y = 0\)?
4. Can you rewrite the expression using absolute values?
5. What if \(a\) were a fraction?

**Tip:** Always be careful with signs when plugging in negative numbers!

Evaluate the expression when a = 4 and y = -5: -3a + y

Learn how to evaluate the algebraic expression -3a + y when a = 4 and y = -5. This problem focuses on basic substitution and arithmetic, suitable for students in Grades 6-8.

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