Quadratic Functions - Getting Ready

Relation

• A set containing pairs of related numbers.
• E.g.
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• Bildunterschrift: A relation

Function

• A relation in which every x-value (or independent value) maps to only one y-value (or dependent value.
• There are more relations than functions because
• All functions are relations,
• But, all relations may not be functions.
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Venn diagram of functions and relations.

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• Bildunterschrift: All functions are relations, but all relations may not be functions.