To find the value of \( 3a + 4 \) when \( a = 5 \), substitute \( a \) with 5:

\[
3a + 4 = 3(5) + 4
\]

\[
= 15 + 4
\]

\[
= 19
\]

Thus, the value of \( 3a + 4 \) is **19**.

Would you like a breakdown of the steps or an explanation of related concepts? Here are some questions to consider:

1. What is substitution in algebra, and why is it useful?
2. How can similar expressions like \( 4a - 7 \) be solved?
3. What happens if \( a \) is a negative number or a fraction?
4. Can this be visualized on a graph? If yes, how?
5. What does the term \( 3a + 4 \) represent in a real-world context?

**Tip:** Always double-check your substitution to avoid small mistakes in calculations.

Learn how to solve the algebraic expression 3a + 4 when a = 5 with a clear step-by-step solution. This problem demonstrates the process of substitution in algebra, suitable for students in Grades 6-8.

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