Algebraic Geometry/Functions

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A function is a relation mapping one set (the domain) to another (the codomain) such that every element in domain has a unique image in its co-domain.

Examples of functions would include 2x+3y=9, 4x+7z=8

function is denoted by symbol f(x) or g(x) where x is the independent variable and function are written as f(x)=7x+9