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11–7The Coordinate PlaneMAIN IDEA• Locate and graphordered pairs on acoordinate plane.BUILD YOUR VOCABULARY (page 262)The coordinate system, or coordinate plane, is a grid used tolocate points.The verticalnumber line isthe y-axis.The origin is at(0, 0). This isthe point wherethe number linesintersect at theirzero points.Quadrant II5432154321 O 1 2 3 4 5 x12Quadrant III 3 Quadrant IV45yQuadrant IThe horizontalnumber line isthe x-axis.Numbersbelow and tothe left of zeroare negative.The x-axis and y-axis separate the coordinatesystem into four regions called quadrants.EXAMPLES Identify Ordered PairsIdentify the ordered pair that names each point.Then identify its quadrant.point PStep 1 Start at the. Moveon the x-axis to findthe x-coordinate of point P,which is .43214321OS 234Step 2 Move down the y-axis to find the y-coordinate,which is .Point P is named by .y1 2 3 4 xPCopyright © Glencoe/McGraw-Hill, a division of The McGraw-Hill Companies, Inc.Point P is in thequadrant.276 Math Connects, Course 1