exam Maths Puzzle Numerical Ability

I am wondering what if an equation had three variables, how would you solve and graph it? Does it change the graph?

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exam Other Question

write an equation for the ellipse that satisfies each set of conditions.
endpoints of major axis at (-9,0) and (9,0), endpoints of minor axis at (0,3) and (0,-3).

I got x2/9+y2/81=1 is this right?
4x -8/(6x² -12x)