Introduction to Functions The Domain of the function is the x-values of the function, the Range of the function is the y-values of the function. Determine the Domain and Range of the following function. {(0,1),(2,4),(4,7),(6,10),(8,13)} Domain = {0,2,4,6,8} Range = {1,4,7,10,13} A set of points is a function, if and only if, for every value of x there is a “unique” value for y. In other words, when you look at a set of points, if an x value is repeated then it had better have the same value for y in both places! Determine whether or not the following sets of points are or are not functions. (A) {(1,2),(3,5),(4,5),(5,8),(9,1)} … D = {1,3,4,5,9} and R = {1,2,5,8} This is a function since no value of x is repeated. (B) {( 1,)}
… D = {1,3,4,5} and R = {2,5,8,9}9This is To evaluate a function at a particular value for x, substitute the value given and calculate. Find f(-1) for the function f(x) = 2x -4. f(x) = 2x –4 f(-1) = 2(-1) -4 f(-1) = -2 –4 f(-1) = -6 Find
f(-2) for the function
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