book Maths Puzzle Numerical Ability

WHICH EQUATION IS PERPENDICULAR TO Y=4X+3?

A. Y=-4X-1
B. Y=-1/4X+2
C. Y=1/4X-6
D. Y=3X+9

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can someone please help me out as soon as possible with this problem: translate "the difference between twelve times a number and the number" into a mathematical expression. tha Suppose M is between L and N.

LM=7y+9
MN+3y+4
LN=143