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

What is the product of the cube of (-2/3)(negative two over three) and the square of (4/-5) (four over negative 5)

Thanks!

D.
I greatly need your help in solving another statistics problem, please? Thanking you in advance for your assistance in this matter!
A coin was flipped 60 times and came up heads 3