exam Maths Puzzle Numerical Ability

Is {(1,1),(2,1),(2,2) and (1,2)} a function?

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exam Other Question

Simplify 9/6-9/2 1.) 4y2-x2+8y+4x-4=0

Please include
a) standard equation form
b) opens up and down, or left and right
c) Vertex
e) Determine A and B
f) Graph (asymptotes, rectangular box)