These tiles represent the expression 2+8x–9.

To simplify the expression \(2 + 8x - 9\), you can combine the constant terms:

1. Combine the constants \(2\) and \(-9\): \[ 2 - 9 = -7 \]

2. Now, the expression can be rewritten as: \[ 8x - 7 \]

Therefore, the equivalent expression to \(2 + 8x - 9\) is: \[ 8x - 7 \]