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A curve
Without an equality sign it is no kind of an equation at all.
Multivariate is probably the most accurate answers. Graphs need not be bivariate - you can have graphs in 3 or more dimensions - not easy to visualise in more than 3-d but that does not mean they cannot exist. Graphs need not represent exact relationships - as any scattergram will demonstrate. Graphs are simply visual representations of information, presented in a form that [hopefully] conveys he information in an effective way. For one of my favourite semi-numeric graphs follow the link to see a graphical representation of Napoleon's invasion of Rusia.
Line graphs show increases or decreases in something over time.
you could use almost any kind of graph if you label it. But i would stay away from pie graphs. I would use a box and whisker plot.