Why Coordinates
Coordinates are numbers used to locate the exact position of a point with respect to a fixed reference line or fixed axes.
Practice This ConceptMain explanation
Teacher explanation
In daily life, position becomes clear only when we use a reference. A seat number in a cinema hall, a row and column in a classroom, or a point on graph paper works because there is a fixed starting point and a fixed direction. Coordinates give the same clarity in mathematics.
Example
If a student sits in row 3 and column 5, the pair (3, 5) helps locate the seat uniquely.
Simple analogy
Plane position needs two clues: across and up.
Common confusion
Students often give only one number for a point on a plane, but two directions are needed to locate a point on a plane.
Exam tip
When a question asks for location on a plane, write the ordered pair clearly and keep the order of the two numbers unchanged.
Answer writing and exam use
1-mark use
Write the exact meaning of why coordinates in one clean line.
2-mark use
Define why coordinates and add one example or condition.
3-mark use
Explain why coordinates, show the method or example, and mention the common mistake.
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