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coordinate plane formed by two real number lines that intersect at a right angle ordered pair each point in the plane corresponds to this, two real numbers x-coordinate the first number in an ordered pair y-coordinate the second number in an ordered pair x-axis horizontal axis in a coordinate plane y-axis vertical axis in a coordinate plane scatter plot one way to anaylze the relationship between two quantities is to graph pairs of data on a coordinate axis solution of an equation two variaables x and y is an ordered pair(x,y) that makes the equation true x-intercept the x coordinate of a point where a graph crosses the x-axis y-intercept the y coordinate of a point where the graph crosses the y axis slope the number of units the line raises or falls for each unit of horizontal change from left to right rate of change compares two different qualities that are changing constant variation the variable K in y=kx direct variation two quantatioes that vary directly slope intercept form the linear equation y=mx+b parallel lines two lines in the same plane that do not intersect relation any set of ordered pairs function notation f(x) "f of x"