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THE COORDINATE PLANE 1-10 VOCABULARY Intersect – to cross or divide something Coordinate Plane – what is formed by the intersection of 2 number lines Axes – the 2 number lines of the Coordinate Plane Axes… The lines that intersect are called axes. The horizontal number line is called the x-axis The vertical number line is called the y-axis The 4 Quadrants The x- and y- axes divide the Coordinate Plane into 4 Quadrants: y Quadrant Quadrant II I x 0 Quadrant III Quadrant IV Quadrants count counterclockwise The Origin 0 is the origin, or the starting point of the intersection. When we work with the Coordinate Plane, we work with 2 number lines. y 3 2 1 -3 -2 -1 01 -1 -2 -3 x 2 3 Ordered Pairs An Ordered Pair gives the exact coordinates, or location, of one particular point. Ordered Pairs are always written in this form: P: (x-coordinate, y-coordinate) Ordered Pair Example y P: (-5, 4) x-coordinate y-coordinate Step 1 – You must go to the x-axis and find your xcoordinate Step 2 – You must go to the y-axis and find your ycoordinate Step 3 – You must connect the 2 numbers you have. The intersection is your point. P: (-5, 4) -6 -5 -4 -3 -2 -1 6 5 4 3 2 1 01 2 3 4 5 6 -1 -2 -3 -4 -5 -6 x Helpful Hints… Here’s some hints to use when figuring out what Quadrant your point will be found in. y II (-, +) I (+, +) x III IV (-, -) (+, -)