If the Domain of a function of real variables $\mathbb R$ is a line, why is the graph of a function of real variables representable in an $\mathbb R^2$ plane?
Is it due to the fact that the function has two sets, one of departure (the domain, the abscissae) and one of arrival (the codomain/range the ordinates) and these two "axes" are a Cartesian product $\mathbb R \times \mathbb R$ effectively making the function representable on a Cartesian plane?