To determine which equation Eduardo modeled using the number line, we can evaluate each option:
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−5 − 3 = −8: If we start at -5 and move 3 units to the left, we'll end up at -8. This equation is correct.
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−5 + 8 = 3: If we start at -5 and move 8 units to the right, we'll end up at 3. This equation is correct as well.
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5 + (−8) = −3: If we start at 5 and move 8 units to the left, we'll indeed reach -3. This equation is also correct.
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5 + (−3) = 2: If we start at 5 and move 3 units to the left, we will arrive at 2. This equation is also correct.
Since multiple equations could potentially be modeled using a number line, we can pick any one of them. However, if you are looking for the most straightforward equation in this context, −5 − 3 = −8 is often the type of operation that corresponds directly with a leftward movement on a number line.
Thus, a possible choice for Eduardo's equation could be: −5 − 3 = −8.