The Four Quadrants
Part of the Graphs & Systems section of Coddy's Algebra journey. Lesson 2 of 64.
The two axes cut the plane into four regions called quadrants. They are numbered counter-clockwise, starting from the upper right. The signs of a point's coordinates tell you which quadrant it is in. Signs (+, +) mean the upper right and (-, +) mean the upper left. Signs (-, -) mean the lower left and (+, -) mean the lower right.
One point in each quadrant, named by its signs
Use the signs to identify the quadrant before plotting. The point (-5, 2) is in the upper-left quadrant, and (1, -4) is in the lower-right quadrant. Check that your plotted point is in the expected quadrant.
Challenge
EasyPlace the points (-3, 2) and (2, -4). One is in the upper left quadrant and one is in the lower right quadrant.
Test yourselfThis lesson includes a short quiz. Start the lesson to answer it and track your progress.
Test yourselfThis lesson includes a short quiz. Start the lesson to answer it and track your progress.
All lessons in Graphs & Systems
1The Coordinate Plane
Two Numbers, One PointThe Four QuadrantsPoints on the AxesMirror PointsRecap: The Plane4Slope-Intercept Form
y = mx + bThe Starting HeightWrite the EquationSolve for yDraw From Any FormRecap: y = mx + b7Parallel & Perpendicular
Same Slope, Never MeetThe Perpendicular SlopeA Right-Angle LineRecap: Two Relations2From Rule to Line
A Rule Makes PointsThe Points Line UpOn the Line or Not?Between the DotsRecap: Rule to Line