Which function can represent the height, y, of the railing in inches according to the horizontal distance in inches, x, from the top of the stairs? y = –StartFraction 3 Over 4 EndFractionx + 36 y = –3x + 36 y = StartFraction 3 Over 4 EndFractionx + 36 y = 3x + 36

Step-by-step explanation:

The missing parameters are:

--- height of rails

The rate of decrement is: 9 for 12

Required

The function

First, we represent the rate (r) as a fraction.

---- negative, because it decreases

Simplify

So, the function is:

Where:

distance from top

So, we have: