The Four Quadrants
Part of the Graphs & Systems section of Coddy's Algebra journey. Lesson 2 of 64.
The axes cut the plane into four quadrants, counted counter-clockwise from the upper right. The signs of x and y say which one a point is in: (+, +) upper right, (-, +) upper left, (-, -) lower left, (+, -) lower right.
One point in each quadrant, named by its signs
So a point can be placed roughly before counting a single step: (-5, 2) must land upper left, (1, -4) lower right. Reading the signs first is a habit that catches most plotting mistakes before they happen.
Challenge
Place the points (-3, 2) and (2, -4): one in the upper left quadrant, one in the lower right.
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