That is not a standard terminology. It could mean either the graph of a function of one variable: y= f(x) in a cartesian coordinate system with one x-axis and one y-axis or (perhaps more likely what you mean) a function of two variables: z= f(x,y). To graph that you need three axes, x, y, z with the z-value (height of a surface above the xy-plane) given by f(x,y).
I have a project which states me to make a two-variable graph. This is for Data Management which is study for statistics. Are "Grade-10" and "Grade-12" variables?
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