book Maths Puzzle Numerical Ability

Determine whether each relation is a funtion, justify your answer.

{(0,1), (1,0), (2,1), (3,1), (4,2)}

HOw do i solve this problem?

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book Other Question

x2+9x=x(__+9) Solve the quadratic equation by factoring and applying the zero product principle.

12xsquare - 41x + 24 = 0

Thank you so much