function, a relation that matches each input with exactly one output, vertical line test, visual way of testing a graph to see if it is a function or not; one points of intersection means it is a function, whereas more than one point means it is not a function, domain, the set of input or x values for a function, range, the set of all output or y values for a function, mapping diagram, , ordered pairs, , table, , graph, , continuous, a type of function where points are connected and intermediate values still have meaning, discrete, a function with distinct, separate values and individual points, increasing, a part/segment of a graph with a positive slope; as x gets bigger, yet gets bigger, decreasing, a part/segment of a graph that has negative slope; as x gets bigger, y gets smaller, linear, a type of function that creates a straight line when graphed and has a constant rate of change, nonlinear, a type of function that does NOT have a constant rate of change and is NOT a straight line.

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