exam Maths Puzzle Numerical Ability

For what value(s) of k the lines y=(k+1)x-3 and (2k-1)x+1 are parallel and are perpendicular?

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exam Other Question

Find the solutions to the equation: x-5/x=4 please help. find m(angle sign)x

M(angle symbol)y=72 degrees
M(angle symbol)z=18 degree

thanks foryour help.