Mathematics Grade 8 15 min

Quadrant and axes

Quadrant and axes

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1

Introduction & Learning Objectives

Learning Objectives Identify and label the x-axis and y-axis on a coordinate plane. Locate the origin (0,0) on a coordinate plane. Name the four quadrants (I, II, III, IV) and understand their numbering convention. Determine the signs of the x and y coordinates in each quadrant. Identify whether a given point lies on an axis or in a specific quadrant. Plot points on the coordinate plane and determine their quadrant or axis location. Ever wonder how GPS knows exactly where you are on a map? 📍 It uses a system much like the coordinate plane we'll explore today! In this lesson, you'll learn about the fundamental building blocks of the coordinate plane: the axes and the quadrants. Understanding these concepts is crucial for graphing linear functions and solving syste...
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Key Concepts & Vocabulary

TermDefinitionExample Coordinate PlaneA two-dimensional plane formed by the intersection of two perpendicular number lines, used to locate points.A graph paper with an x-axis and y-axis drawn on it is a visual representation of a coordinate plane. X-axisThe horizontal number line on the coordinate plane, extending infinitely in both positive and negative directions.When you move right from the center, you're moving along the positive x-axis; moving left is along the negative x-axis. Y-axisThe vertical number line on the coordinate plane, extending infinitely in both positive and negative directions.When you move up from the center, you're moving along the positive y-axis; moving down is along the negative y-axis. OriginThe point where the x-axis and y-axis intersect, represented...
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Core Formulas

Quadrant Sign Convention $ \text{Quadrant I: } (x > 0, y > 0) \Rightarrow (+, +) \text{Quadrant II: } (x < 0, y > 0) \Rightarrow (-, +) \text{Quadrant III: } (x < 0, y < 0) \Rightarrow (-, -) \text{Quadrant IV: } (x > 0, y < 0) \Rightarrow (+, -) This rule describes the specific combination of positive and negative signs for the x-coordinate and y-coordinate for any point located within each of the four quadrants. Quadrants are numbered counter-clockwise starting from the top-right. Points on Axes $ \text{Points on the x-axis: } (x, 0) \quad (\text{where } y = 0) \text{Points on the y-axis: } (0, y) \quad (\text{where } x = 0) This rule helps identify points that lie directly on either the horizontal (x) or vertical (y) axis. If a point's y-coo...

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Sample Practice Questions

Challenging
The point (a, b) is in Quadrant I. The point (c, d) is in Quadrant III. In which quadrant must the point (a, d) be located?
A.Quadrant I
B.Quadrant II
C.Quadrant III
D.Quadrant IV
Challenging
A point (m, n) is located on the x-axis, but it is not the origin. What is the value of the expression n/m?
A.0
B.1
C.Undefined
D.It cannot be determined
Challenging
If |a| = 4 and |b| = 6, and the point (a, b) is in Quadrant III, what are the coordinates of the point?
A.(4, 6)
B.(-4, 6)
C.(4, -6)
D.(-4, -6)

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