Question

A sand dune stands 5 feet above sea level. The hill is eroding at a rate of 1 foot per 20 years. Let y represent the height of the sand dune after x years. Which equation represents the situation?
a y = negative StartFraction 1 Over 20 EndFraction x minus 5
b y = negative StartFraction 1 Over 20 EndFraction x + 5
c y = negative 20 x minus 5
d y = negative 20 x + 5

Answer 1

Answer:

$\: \:$

y at initial time is 5 and therefore 5 is a constant

x is the amount of years so it is one foot per 20 years therefore (1/20) x or (x/20)

The height of the sand dune at any time is 5 foot - (x/20)

therefore 

y= 5-(x/20)

Answer 2

Step-by-step explanation:

y at initial time is 5 and therefore 5 is a constant

x is the amount of years so it is one foot per 20 years therefore (1/20) x or (x/20)

The height of the sand dune at any time is 5 foot - (x/20)

therefore

y= 5-(x/20)

MARK AS BRANLIEST