A businesswoman needs to fly to Bulgaria for a conference. She watches the prices for flights and records the prices each Monday on the graph below.
The x-axis (horizontal) shows the number of weeks leading up to the flight. Therefore, if x = 5, it means that the flight is in 5 weeks. If x = 10, the flight is in ten weeks, and so on.
Which of the following is true of the graph?

Question

A businesswoman needs to fly to Bulgaria for a conference. She watches the prices for flights and records the prices each Monday on the graph below.
 The x-axis (horizontal) shows the number of weeks leading up to the flight. Therefore, if x = 5, it means that the flight is in 5 weeks. If x = 10, the flight is in ten weeks, and so on.
Which of the following is true of the graph?

Quizplus · Accepted Answer

This graph cannot be used to estimate prices for other flights. Since the data was only based on one flight, we cannot make assumptions about other flights, nor can we compare flights to other destinations.
We can estimate the price differential between two different weeks on the graph. We can estimate the price of each and then subtract them. This will give you an estimate of the difference in price between weeks.

A Businesswoman Needs to Fly to Bulgaria for a Conference