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?
y = negative StartFraction 1 Over 20 EndFraction x minus 5
y = negative StartFraction 1 Over 20 EndFraction x + 5
y = negative 20 x minus 5
y = negative 20 x + 5
Since the hill is eroding at a rate of 1 foot per 20 years, the height of the sand dune after x years can be represented as y = -1/20x + 5.
The equation that represents the situation is:
y = -1/20x + 5