the function that represents total spending in an economy at a given level of real disposable income.
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In simple terms, if a vertical line meets a graph in more than one place it is not a function.
Discrete Function - A function that is defined only for a set of numbers that can be listed, such as the set of whole numbers or the set of integers. Explicit Definition - A definition of a function by a formula in terms of the variable.
No. It represents a function of x in terms of y but, in strict mathematical terms, not a function of y in terms of x. This is because the mapping from the domain (x values) to the range (y values) is 1-to-many. For each value of x, there can be 2 values of y. For example, x = 0 gives y2 = 1 so that y = ±1.
you have to tell if the arms are pointing up or down on a function