No, linear equations don't have x2.
Equation with x and y are usually linear equations.
Equations with either x2 or y2 (but never both) are usually quadratic equations.
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Two equations: a linear one in y and a quadratic in x.
no, because xx=x squared, and x squared is not linear
YES, all linear equations have x-intercepts. because of the x, y has to be there 2!
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