Section 8 6 The Coordinate Plane Vocabulary Coordinate

Section 8. 6 The Coordinate Plane

Vocabulary • Coordinate plane – a plane in which a horizontal number line and a vertical number line intersect at their zero points • X-axis – the horizontal number line • Y-axis – the vertical number line • Origin – the point where the number lines intersect at their zero points (0, 0) • Quadrants – the x-axis and y-axis separate the coordinate plane into four regions • Ordered pair – a pair of numbers used to locate a point in the coordinate plane. Written (x-coordinate, y-coordinate) • X-coordinate – the first number of an ordered pair (positive = right, negative = left) • Y-coordinate – the second number of an ordered pair (positive = up, negative = down)

The 4 Quadrants Y II I (-, +) Origin (+, +) III (-, -) IV (+, -) X

Identify the ordered pair that names the point P. Then identify its quadrant. Step 1 Start at the origin. Move right on the xaxis to find the x-coordinate of point P, which is 2. Step 2 Move down the y-axis to find the ycoordinate, which is – 4. P

Identify the ordered pair that names the point A. Then identify its quadrant. A

Identify the ordered pair that names the point S. Then identify its quadrant. Step 1 Start at the origin. Move left on the x-axis to find the x-coordinate of the point S, which is – 3. Step 2 Move down the y-axis to find the ycoordinate, which is – 2. S

Identify the ordered pair that names the point B. Then identify its quadrant.

Graph point A at (– 4, 3).

Graph point C at (2, – 4).

Example 4 • Graph the point D at (-4, 0).

Your Turn • Graph the point E at (0, 3).

Assignment • Page 323 #15 -32 all