To find how many miles the whale swims in 16 days, we need to determine its rate of swimming first.
The whale swims 200 miles in 5 days, which gives us a rate of:
\[ \text{Rate} = \frac{200 \text{ miles}}{5 \text{ days}} = 40 \text{ miles per day} \]
Now, to find out how far the whale swims in 16 days, we can use the rate we just calculated:
\[ \text{Distance} = \text{Rate} \times \text{Time} = 40 \text{ miles per day} \times 16 \text{ days} \]
This results in:
\[ y = 40 \times 16 \]
So the correct equation to use is:
y = 40 × 16 (this is the correct response).