I think this works well as a paired consolidation activity. Based on the popular board game, but rather than identifying people, you are identifying graphs and rather than asking about hair colour, you are asking about gradient, y-intercept, etc.
Full details and graphs to print on a nice big A3 sheet are in this Powerpoint.
mho maths 
Nice!
If you have the tech available (though tech free does remove the horrors of waiting to login, forgotten passwords etc,) then you might want to check out:
https://teacher.desmos.com/polygraph
for a multitude of variations on this!
all the best,
Nik
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