7 grade Open lesson The function. The graph of a function.
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7 grade Open lesson »The function. The graph of a function.» There are many variables around us. Some of them are closely related to each other and some of them are not. For instance, the number of students in a classroom and the quantity of oxygen in the same classroom are closely related. But the number of students in a classroom and the temperature outside are not related at all. Functions are used to show this relation between variables. Using that relation we can estimate the results for possible cases.