exam Maths Puzzle Numerical Ability

Determine whether the relation is a function.
(0,4),(1,4),(2,5),(3,6),(4,6)

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exam Other Question

(x^2+x-1)(x^2+x-1) line j is perpendicular to the line with the given equation and line j passes through P. Write an equation of line j.

y=3x +4, P(0,-2)