book Maths Puzzle Numerical Ability

What are some examples of a non-function to graph on a TI-83 Plus?

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8y-3z+4y I'm really lost. Please help me. Here's the problem: f(x)=ax+b f(f(f(x)=8x+21 Find a and b.
Can you please explain triple functions and how to solve them relating to this problem?