2. Coordinate Plane In this unit we'll be learning about equations in two variables. A coordinate plane is an important tool for working with these equations. It is formed by a horizontal number line, called the x-axis , and a vertical number line, called the y-axis . The two axes intersect at a point called the origin . You can locate any point on the coordinate plane by an ordered pair of numbers (x,y), called the coordinates. Next Back
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4. To create a coordinate plane: Coordinate Plane 2. Next draw a vertical line that intersects the x axis at zero. This line is called the y-axis and is used to locate the values of y. Mark off a number line with zero in the center, positive numbers going upwards, and negative numbers going downwards . Back Next
7. Locating Points Using Ordered Pairs - The first number in the ordered pair is the x coordinate. - The second number in the ordered pair is the y coordinate . Back Next
8. - To plot a point, start at the origin and count along the x axis until you reach the x coordinate, count right for positive numbers, left for negative. - Then count up or down the number of the y coordinate (up for positive, down for negative.) Locating Points Using Ordered Pairs Back Next
9. To make it easy to talk about where on the coordinate plane a point is, we divide the coordinate plane into four sections called quadrants. Quadrants (+, +) (+, -) (-, +) (-, -) Back Next
