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Math Question

We got flight times and distances airplanes travel all leaving from the same city. We graphed time as the X variable and distance as the Y variable. (time, distance)

Now, we were to find a best-fit line for the data. I did that. A question now asks, Which model did you choose? I have no clue what it wants me to say, best-fit line?

After that it asks for the real world meaning of the slope. Would it be so simply that the longer the distance the longer the time to get there?

Then it asks for the x and y intercept's real world meaning. What do these mean?
 
Which model: straight line (y = kx + m), exponential (y = a^(bx)), logarithmic, etc. I'm guessing you used the straight line.
 
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