The number of chairs in the auditorium is represented by the variable "x."

Let's say "r" represents the number of red chairs in the auditorium.

Then, the number of blue chairs can be represented by the expression:

Number of blue chairs = x - r

Since there are "x" total chairs, and "r" of them are red, the remaining chairs would be blue (x - r).

Hope it helps you

Answer:

Blue chairs= Total chairs - Red chairs.

Step-by-step explanation:

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