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The Coordinate Plane By: Christine Berg Edited By:VTHamilton Definition Coordinate Plane The plane formed when 2 perpendicular number lines intersect at their zero points Coordinate Plane The perpendicular number lines form a grid on the plane X-axis The horizontal number line • Positive to the right • Negative to the left Y-axis The vertical number line • Positive upward • Negative downward Origin Where the x and y axes intersect at their zero points Quadrants The x and y axes divide the coordinate plane into 4 parts called quadrants II I III IV Ordered Pair A pair of numbers (x , y) assigned to a point on the coordinate plane Ordered Pair X-coordinate (x , y) Y-coordinate Plotting a Point Step 1: Begin at the Origin Plotting a Point Step 2: Locate x on the x-axis Plotting a Point Step 3: Move up or down to the value of y Plotting a Point Step 4: Draw a dot and label the point In Your Own Words • • • What is a coordinate plane? Define origin How do you plot a point?