To simplify the expression \( 9x - 10y + 2a \) where \( a = 3 \), we substitute \( a \) with 3:

\[
9x - 10y + 2(3) = 9x - 10y + 6
\]

So, the simplified expression is:

\[
9x - 10y + 6
\]

Would you like further details or have any questions?

Here are some related questions:
1. What happens if \( x = 2 \) and \( y = 1 \)?
2. How do you solve for \( x \) if this expression equals 0?
3. What if \( a \) was a different constant? How would that change the outcome?
4. How can you graph this expression in terms of \( x \) and \( y \)?
5. What are the conditions for this expression to equal a specific value, say 10?

**Tip:** Always substitute known values carefully to avoid errors in simplification.

Learn how to simplify the expression 9x - 10y + 2a by substituting the constant a = 3. This solution demonstrates key algebraic concepts including substitution and simplification, suitable for students in Grades 6-8.

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