To find how many miles a whale swims in 16 days based on the information that it swims 200 miles in 5 days, we first need to determine its daily swimming rate.
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Calculate the daily distance: \[ \text{Daily Distance} = \frac{200 \text{ miles}}{5 \text{ days}} = 40 \text{ miles/day} \]
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Now, to find out how far it swims in 16 days: \[ \text{Distance in 16 days} = 40 \text{ miles/day} \times 16 \text{ days} = 640 \text{ miles} \]
Thus, the equation we can use to find the distance in 16 days is: \[ y = 40 \times 16 \]
So the correct response is: y = 40 × 16.