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Ch 1.8 notes Coordinate Plane: two number lines that intersect at right angles. X-axis: the horizontal axis. Y-axis: the vertical axis. Origin: where the axis intersect. Quadrants: the four sections that make up the coordinate plane. Ordered pair: identifies the location of a point. y-axis Coordinates: numbers in an ordered pair. Ordered pair: (9, 3) X-coordinate Y-coordinate origin Quad. II Quad. I X-axis Quad. III Quad. IV Independent variable (x-axis): An independent variable is the variable you have control over, what you can choose and manipulate. Dependent Variable (y-axis): A dependent variable is what you measure in the experiment and what is affected during the experiment. The dependent variable responds to the independent variable. It is called dependent because it "depends" on the independent variable. Muscle Mass Scatter Plot: uses a coordinate plane to display paired data. A scatter plot may suggest whether a relationship exists between two sets of data. Hours spent in gym Practice • Plot the following points on a coordinate plane in your notes: • (5, 3) (-2, -2) (3, 4) (3, -4) • Give the coordinates of each point seen in the graph below: • Graph the following data: Hours spent Studying GPA 5 2 1 0 3.8 3.1 2.5 2.0