exam Maths Puzzle Numerical Ability

which is the slope of a line perpendicular to the y=-2x+6?
A.2
B.1/2
C.-1/2
D.-6
E.-1/6

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exam Other Question

can you please explain this step by step?
3k+5=11
6(2x-5)+4(3x-2)

-(x+5)-(3x-12)