Two Numbers, One Point

Part of the Graphs & Systems section of Coddy's Algebra journey. Lesson 1 of 61.

$The points (3, 2) and (2, 3) on a grid, in two different places$

A point on a grid has two numbers. (3, 2) means: start in the middle, go 3 steps right, then 2 steps up. (2, 3) is a different point. The first number goes across. The second number goes up. A negative number goes left or down.

Challenge

Place the points (5, 2) and (-3, 4). 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 PointA 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 Quadrants Mirror 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