The model you're describing seems to use colored tiles to represent different values in an algebraic equation involving the variable \(x\). In many algebra tile models:
- Red tiles typically represent negative quantities.
- Long tiles usually represent a variable (e.g., \(x\)).
- Square tiles usually represent constant values (e.g., 1).
Given this information, in the equation:
- 2 long \(x\) tiles represent \(+2x\).
- 3 square 1 tiles represent \(+3\).
- 3 negative \(x\) tiles represent \(-3x\).
The "three red tiles" in this context represent the negative quantity. Specifically, they represent \(-3\) (since they are square tiles, each representing \(-1\)), contributing to the total negative value in the equation.
So, to summarize:
- The three red tiles represent \(-3\), indicating a negative constant added to the model.