Let's simplify the expression step by step:

Given:
$2x + 3y - x$

Combine like terms (the terms with $x$):

• $2x - x = x$

So, the simplified expression is: $x + 3y$

Would you like more details on this? Or do you have other questions?

Related Questions:

1. How would you solve for $x$ or $y$ in an equation involving $x + 3y$?
2. What happens if you set the expression equal to a number, like $x + 3y = 10$?
3. How would you factor an expression like $x + 3y$?
4. Can this expression represent a line in the coordinate plane? If so, what is its slope?
5. How would you handle similar expressions with multiple variables?

Tip: Always combine like terms when simplifying expressions to make solving easier.