exam Maths Puzzle Numerical Ability

Can someone please help me with this problem too.
Write an equation in slope-intercept form that satisfies each condition.
passes through (2,-1) and is perpendicular to 3x-y=-3

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exam Other Question

find the arithmetic mean between 2.5 and 9.5 HOW IN THE WORLD DO YOU DO THAT????? Completely factor the following: x^4 - 13x^2 + 36

This what I have done, please let me know if it is right, or not, what I did wrong thanks, lackinmath

(x^2-9)(x^2-4)
(x-3)(x+3)(x-2)(x+2)