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There is one form of linear equation that is not a function, and that is when x = c, where c is a constant.
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
no, because xx=x squared, and x squared is not linear
Yes, since y = x - 2 has the degree of 1 [or the highest exponent of the equation], x - 2 is the linear equation.