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A list of x-values and their corresponding y-values.
y always decreases when x increases and y always increases when x decreases.
A pair of numbers in a specific order. For example, (3, 7) and (8, - 1) are ordered pairs. Two ordered pairs are equivalent if their first members are equal and their second members are equal. However, the order of the two numbers is important; (1, 2) is not equivalent to (2, 1).
The point (0, 0).
Two lines are parallel if they have the same slope. Parallel lines, when extended, do not intersect at any point.
Two lines are perpendicular if their slopes are opposite reciprocals of each other. Perpendicular lines intersect each other at right angles.
y always increases when x increases, and y always decreases when x decreases.
Given two points (x1, y1) and (x2, y2) on a line, the slope of the line is equal to:
m =  |
The horizontal axis of a graph, with which the x-values are plotted.
The number which corresponds to the value of x in an ordered pair.
The point at which the graph of a line crosses the x-axis. The point at which y = 0.
A two-dimensional way of representing points. x-values are plotted with the horizontal axis, and y-values are plotted with the vertical axis. 
The vertical axis of a graph, with which the y-values are plotted.
The number which corresponds to the value of y in an ordered pair.
The point at which the graph of a line crosses the y-axis. The point at which x = 0.
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