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Two Shadings Overlap

Part of the Graphs & Systems section of Coddy's Algebra journey. Lesson 59 of 64.

Two inequalities asked together shade two half-planes, and the solutions of the system live where the shadings overlap. For y > x - 2; y <= -x + 4 the overlap is the wedge above the first line and on-or-below the second.

$One shading of the pair; the solution is where both hold$

One shading of the pair; the solution is where both hold

Each boundary keeps its own fence rule, one dashed and one solid here, and a point solves the system only when it satisfies every inequality at once, the "and" of chapter logic drawn as a region.

Challenge

Shade the system y > x - 1; y < -x + 3: both conditions, one picture.

Try it yourself

y > x - 1y < -x + 3

Draw the graph

Test yourself

This 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 Point The Four Quadrants Points on the Axes Mirror Points Recap: The Plane

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

2From Rule to Line

A Rule Makes Points The Points Line Up On the Line or Not?Between the Dots 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

3Slope

Steepness as a Number Slope From Two Points Downhill Lines Flat and Straight Up A Fraction of a Slope Recap: Slope

6Standard Form

Ax + By = C The Two Intercepts Draw by Intercepts Between the Forms Recap: Standard Form

9Shaded Regions

A Line Splits the Plane Solid or Dashed Test a Point Rearrange, Then Shade Recap: Half-Planes

12Final Challenges

Two Shadings OverlapThe Corner of a Region Final: Round Trip Final: Where They Meet Final: Draw the Fence Final: The Whole Plane

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