slope - a ratio that describes the change in y-coordinates as compared to the change in x-coordinates, rate of change - a comparison of two quantities that are changing, origin - the point where the x-axis and y-axis of a coordinate plane intersect, the coordinate is (0,0), coordinate - a set of values that show an exact position (x,y), linear equation - an equation that describes all of the points that form a line, positive slope - the line is increasing from left to right on the graph, the x and y values are both increasing, negative slope - the line is decreasing from left to right on the graph, as the x-value increases the y-value decreases, zero slope - when the x-value increases the y-value remains the same or constant, the result is a horizontal line, undefined slope - the line only moves up and down not horizontally; the rise or x-value is 0; the line is at its steepest, slope intercept form - y=mx+b, where m is the lope of the line and b is the y-intercept, y-intercept - point where a line crosses the y-axis, x-intercept - the point where a line crosses the x-axis, input - the x-coordinate in a relation, output - the y-coordinate in a relation, function - a relationship in which each input has exactly one output, vertical line test - if a vertical line can be drawn so that it passes through more than one point on a graph, then the relation is not a function, linear functions - a function whose graph is a straight line, non-linear function - function whose graph does not form a straight line, parabola - a u-shaped line created when a quadratic is graphed, increasing nonlinear function - a nonlinear line that is increasing, decreasing nonlinear function - a nonlinear line that is decreasing, decreasing & increasing nonlinear function - a nonlinear line that is decreasing & increasing,

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