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It can be written in the form of $$ax+by+c = 0$$ where $$a$$, $$b$$ and $$c$$ are real numbers, both $$a$$ and $$b$$ are not equal to zero, $$x$$ and $$y$$ are variables and $$c$$ is a constant.
$$x+y = 2$$, $$x+2y = 6$$, $$3x = 9y$$, $$-2y+\frac{1}{4} = 4x$$