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a linear equation is simply an equation in the form x+y quadratics, cubics and quartics are all non-linear, and are in the following forms Quadratics - x^2+x+y Cubics - x^3+x^2+x+y Quartics - x^4+x^3+x^2+x+y
They are not. A vertical line is not a function so all linear equations are not functions. And all functions are not linear equations.
Linear equations are a small minority of functions.
Most functions are not like linear equations.
There are linear functions and there are quadratic functions but I am not aware of a linear quadratic function. It probably comes from the people who worked on the circular square.