Abscissa math definition2/19/2023 Emphasize the importance of moving right for the first number in the ordered pair and up for the second number. Have students verbalize how to locate the point for each of the other ordered pairs.Ask: How would you locate the point for (6,4) on the grid?Students should say to "start at 0, move 6 units to the right, then 4 units up." Mark this point on the grid for the class to see.Say: Let's locate these ordered pairs on a grid.You can help them by using the rule to write each ordered pair as an equation: 6 – 2 = 4, 7 – 2 = 5, 8 – 2 = 6, 9 – 2 = 7. Ask: Does the same rule apply to the other ordered pairs?Students should notice that each ordered pair follows this rule.Ask: What rule describes the relationship between the numbers in this ordered pair?Although many rules work for this pair in isolation, elicit from students this rule: the first number minus two equals the second number.Write these ordered pairs where all students can see them: (6,4) (7,5) (8,6) and (9,7).Prerequisite Skills and Concepts: Students should know about ordered pairs and locating points on a grid. Label the x- and y-axes from 0 through 10. Preparation: Draw a large coordinate grid that the entire class can see. Materials: Poster paper or a way to display a coordinate grid publicly for the class straightedge Key Standard: Graph points on the coordinate plane. A day spent plotting coordinates that fall in a straight line will be a day well spent. Your students may have encountered ordered pairs last year, but it's a good idea to start by reviewing how to locate a point on a grid from an ordered pair. Introducing the Concept Finding and Graphing Points for Linear Relationships ICLE (International Center for Leadership in Education)Ĭustomer Service & Technical Support Portal Into Algebra 1, Geometry, Algebra 2, 8-12 Science & Engineering Leveled Readers, K-5
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