Final answer:
To model the equation X + 8 = X + (-8) using algebra tiles, represent X with a blue tile, +8 with a yellow tile, and -8 with a red tile.
Step-by-step explanation:
To model the equation X + 8 = X + (-8) using algebra tiles, we can represent the variable X using a blue tile. Since we have +8 on one side and -8 on the other side, we can represent the positive 8 with a yellow tile and the negative 8 with a red tile.
So, on one side, we have the blue tile (representing X) and the yellow tile (representing +8) together. On the other side, we have just the blue tile (representing X).
Therefore, the correct way to model the equation X + 8 = X + (-8) using algebra tiles is to have the blue tile and the yellow tile on one side, and only the blue tile on the other side.