Mathematics Grade 8 15 min

Graphing integers

Graphing integers

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1

Introduction & Learning Objectives

Learning Objectives Identify and locate positive and negative integers on a number line. Plot single integers accurately on a number line. Graph ordered pairs of integers (x, y) on a coordinate plane. Identify the x-coordinate and y-coordinate of a given point on a coordinate plane. Determine the quadrant in which a graphed integer point lies. Understand how to use a number line to compare and order integers. Ever wondered how we can visually represent numbers that go below zero, like temperatures or debt? 📉 In this lesson, you'll discover how to graph integers on both a number line and a coordinate plane. This skill is fundamental for understanding more complex mathematical concepts like linear functions and systems of equations, which you'll encounter later in...
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Key Concepts & Vocabulary

TermDefinitionExample IntegerAny whole number (positive, negative, or zero).Examples of integers include -3, 0, 5, -100, and 27. Number LineA straight line with numbers placed at equal intervals along its length, used to visualize the order and position of numbers.A horizontal line with 0 in the center, positive numbers to the right, and negative numbers to the left. OriginThe starting point on a number line (0) or the intersection of the x-axis and y-axis on a coordinate plane (0,0).The point where the x and y axes cross on a graph. Coordinate PlaneA two-dimensional surface formed by two perpendicular number lines (axes) that intersect at the origin, used for graphing ordered pairs.A grid system, often seen on graph paper, with an x-axis and a y-axis. x-axisThe horizontal number line on...
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Core Formulas

Graphing an Integer on a Number Line To graph an integer $n$ on a number line, locate the position corresponding to $n$ and place a dot on the line at that point. Positive integers are located to the right of 0, while negative integers are located to the left of 0. The distance from 0 represents the absolute value of the integer. Graphing an Ordered Pair on a Coordinate Plane To graph an ordered pair $(x, y)$, start at the origin $(0,0)$. Move horizontally $x$ units (right for positive $x$, left for negative $x$). Then, from that position, move vertically $y$ units (up for positive $y$, down for negative $y$). Place a dot at the final location. The x-coordinate tells you how far to move along the x-axis, and the y-coordinate tells you how far to move along the y-axis. Always...

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Sample Practice Questions

Challenging
A point starts at P(-2, 5). It is then moved 6 units to the right and 8 units down. What are the coordinates of its new position, and in which quadrant does it now lie?
A.(-8, -3), Quadrant III
B.(4, -3), Quadrant IV
C.(4, 13), Quadrant I
D.(-8, 13), Quadrant II
Challenging
The point (k, -4) lies in Quadrant III. Which of the following statements about the integer k must be true?
A.k is a negative integer.
B.k is a positive integer.
C.k must be equal to -4.
D.k must be equal to 0.
Challenging
Point A is at (-5, 3). Point B is located 7 units to the right of and 6 units below Point A. What are the coordinates of Point B, and in which quadrant is it located?
A.(2, 9), Quadrant I
B.(-12, -3), Quadrant III
C.(-12, 9), Quadrant II
D.(2, -3), Quadrant IV

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