exam Maths Puzzle Numerical Ability

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)

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exam Other Question

Determine whether the relation is a function.
(0,4),(1,4),(2,5),(3,6),(4,6)
Add or subtract. Write the answer in lowest terms.

x
over
x-4

plus

8
over
x+4

minus

32
over
x^2-16