The Four Quadrants

Part of the Graphs & Systems section of Coddy's Algebra journey. Lesson 4 of 61.

The x-axis goes across and the y-axis goes up. These two axes split the grid into four parts, called quadrants. The signs of a point's two numbers tell you its quadrant.

$One point in each of the four quarters of the grid, with its signs$

If one number is 0, the point is on an axis: (4, 0) is on the x-axis, and (0, -3) is on the y-axis.

Challenge

Place (-3, 2), (2, -4) and (-5, 0). Drag each dot to its spot on the grid.

Start the lesson to read it in the interactive player and track your progress.

All lessons in Graphs & Systems

1Points and Rules

Two Numbers, One Point A Rule Makes Points The Points Line Up

4Slope-Intercept Form

y = mx + b The Starting Height Write the Equation Solve for y Draw From Any Form Recap: y = mx + b

7Parallel & Perpendicular

Same Slope, Never Meet The Perpendicular Slope A Right-Angle Line Recap: Two Relations

10Systems by Graphing

Two Lines, One Answer Solve by Drawing Check the Crossing When Lines Never Cross Recap: By Graphing

2The Whole Plane

The Four QuadrantsMirror Points On the Line or Not?Recap: Rule to Line

5Point-Slope Form

A Point and a Slope From Two Points Flat or Vertical Through Draw From a Point Recap: Point-Slope

8Function Notation

The Name of a Rule Inputs With Signs Find the Input The Graph of f Recap: f(x)

11Solving Systems Exactly

Substitution Isolate First Elimination Scale, Then Add Three Unknowns Two Numbers, Two Facts Recap: Two Methods