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The expression to evaluate is \( x + 9y \) with the values \( x = -3 \) and \( y = -4 \).

Let's substitute the values into the expression:

\[
x + 9y = (-3) + 9(-4)
\]

Now, calculate:

\[
x + 9y = -3 + (-36) = -3 - 36 = -39
\]

Thus, the expression evaluated at the given values is \( \boxed{-39} \).

Would you like more details or further clarification?

Here are 5 related questions:
1. How would the result change if \( y = -3 \) instead of \( y = -4 \)?
2. Can you explain how the distributive property applies to this expression?
3. What would the expression \( x + 9y \) look like if you generalized it for any values of \( x \) and \( y \)?
4. How would the result differ if the expression was \( 9x + y \) instead of \( x + 9y \)?
5. What would happen if you added a third variable, such as \( z \), into the expression?

**Tip:** Always perform operations step by step to avoid mistakes, especially when dealing with negatives and parentheses.

Evaluate the expression x + 9y for x = -3 and y = -4.

Learn how to evaluate the algebraic expression x + 9y for given values of x = -3 and y = -4. This problem uses basic substitution and highlights the importance of following the order of operations. Suitable for Grade 6-8 students.

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