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# Functions Vocab

TermDefinition
x axis a line on a graph that runs horizontally through zero
y axis a line on a graph that runs vertically through zero
coordinate plane the plane containing the x axis and the y axis
ordered pair a specific location on a graph named by it’s x coordinate, y coordinate (x, y)
function a special relationship between values where each of its input values gives back exactly one output value
input the number or value that is entered to get the output. The input is represented as x, in the equation y = 5 + x
output the number or value that is the result of a given input. The output is represented as y, in the equation y = 5 + x.
horizontal a line that runs left-to-right, across
vertical a line is one which runs from up and down
relation a set of one or more ordered pairs
function a special type of relation with a rule that there is exactly one output (y) for each input (x)
relation (only) a set of ordered pairs that repeats an x-value
function and relation a set of ordered pairs where the x-values are different