# MAT120_Unit2_Section2-2definition.pdf - MAT 120 College...

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MAT 120 College Algebra Unit 2 Homework Section 2-2 Graphs of Functions MAT 120 College Algebra Unit 2 Homework Sec:on 2-­‐2 1
Functions: Terminology Relation = ordered pairs (x, y) x = input = independent variable y = output = dependent variable Function = a relation where there is one and only one value of y for each distinct value of x Domain = all possible values of x Range = all possible values of y MAT 120 College Algebra Unit 2 Homework Sec:on 2-­‐2 2
MAT 120 College Algebra Unit 2 Homework Sec:on 2-­‐2 3 A function is a relation in which, for each distinct value of x , there is one and only one value of y . If each vertical line intersects a graph in at most one point, then the graph is that of a function. Is it a function? Vertical Line Test
MAT 120 College Algebra Unit 2 Homework Sec:on 2-­‐2 4 Is it a function? x y Is it a Function? Use the Vertical Line Test x y Yes! Because any virtual vertical line drawn through the graph intersects in one and only one place.
x y MAT 120 College Algebra
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