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The Two Intercepts

Part of the Graphs & Systems section of Coddy's Algebra journey. Lesson 29 of 64.

The same trick both ways gives both crossings of 3x + 2y = 6: setting y = 0 leaves 3x = 6, the x-intercept (2, 0); setting x = 0 leaves 2y = 6, the y-intercept (0, 3).

$3x + 2y = 6 and its two intercepts$

3x + 2y = 6 and its two intercepts

Set the other one to zero: that is the entire method. Each intercept is a point with a zero in it, which is exactly what chapter 1 said about points on the axes.

Challenge

The line 2x + 5y = 10 is drawn. Work out both intercepts and place them.

Try it yourself

2x + 5y = 10

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