Consumption of foods with high calories leads to increase in weight. This means that consumption of calories is a function of the increase in weight. For each extra calorie consumed, there is an extra weight to be gained. It is important for people to know how to balance their calorie intake. It is important for people to have the proper body weight to ensure overall good health and improved quality of life. The calories taken in should be equal to the calories lost so as to ensure maintenance of body weight. If the calories consumed do not equal the calories expended, a person will gain weight. On the other hand, if the calories taken in are less than the calories expended, a person will lose weight. Therefore, calorie consumption is a function of the increase in weight.
For people travelling on airplane, the cost of a ticket is not a function of air travel. This is because the airplane has several classes that have different prices yet they are all in the same plane. Air travel can be classified into domestic and international flights. The domestic flights are flights within the same country. International flights are those flights whose departure and arrival points are two different countries. For the domestic flights, there are usually two classes that include first class and economy class. For the international flights, an airplane may have four classes which include first class, business class, premium economy and economy class. All the passengers will travel on the same airplane, but the price of their air ticket will depend on the class of travel. In this case, the price of the air ticket is not a function of air travel.
In conclusion, functions are relationships existing between two or more variables (Bloch, 2011). A situation is termed as a function when the variables involved are said to affect one another. This means that an increase or decrease of one variable will lead to an increase or decrease of the other variable.
References
Bloch E. D. (2011). Proofs and Fundamentals: A First Course Abstract in Mathematics. New York: Springer.
