# Cartesian Plane

Monday, January 23rd, 2012 at
4:05 pm

# Cartesian Plane

## The Cartesian Plane is used to plot points. A rectangular coordinate system consists of points called ordered pairs. (x,y) The coordinates of the points and listed in alphabetical order so x comes first in an ordered pair (x,y).

### x-axis –> horizontal number line

### y-axis –> vertical number line

### origin –> point of intersection (0,0)

### quadrants –> there are four ( I, II, III, IV)

### ordered pair (x,y) –> called the coordinates

### x- coordinate –> abscissa

### y-coordinate –> ordinate

### plot points –> x first (left/right) and y second (up/down)

### Sample questions:

### 1. In which quadrant would you find the following points?

### a) (-1,1) A: II

### b) (2,-1) A: IV

### c) (3,4) A: I

### 2. Name the quadrant for the following points. Then move each point 2 units to the right and up 5 units. Name the position of each new point and which quadrant it is in now.

### Starting Point Quadrant Right 2, Up 5 Quadrant

### a) (-1,-1) III (1,4) I

### b) (-2,-4) III (0,1) y-axis

### c) (2,-3) IV (4,2) I

**Filed under: **Pre-requisites for Pre-Calculus

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