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Romilda is performing an experiment where she is measuring the evaporation rate of water. she records the depth of the water in a jar, measured in centimeters, for ten days. a linear equation that models the results of her experiment is y=-1.2x+1.5. what does the slope of this model suggest about the evaporation rate?

A. the height of the water decreases about 1.2 cm per day.

B. the height of the water increases about 1.2 cm over ten days.

C. the height of the water increases about 1.2 cm per day.

D. the height of the water decreases about 1.2 cm over ten days.

Answer :

The typical equation for a straight line is
y = mx + b
where
m = slope
b = y-intercept
x = independent variable
y = dependent variable

Romilda's experiment yields the relation
y = -1.2x + 1.5
where 
x = days 
y =  depth of water.

The slope is -1.2, and it represents the decrease in height per day.

Answer: A. the height of the water decreases about  1.2 cm per day.

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