book Maths Puzzle Numerical Ability

Suppose M is between L and N.

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

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book Other Question

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 question is: f(x)= -3x^2+5x

List the y-intercept, if there is one, of the graph of f.