Question

water accounts for about 60% of a person's body weight.
a. write an equation that represents the water y of a person who weights x pounds. identify the independent variable and the dependent variable.
b. make an input-output table for the equation in part (a) use the inputs 100, 120, 140, and 160.
c. find the domain and range of the function represented by the table.

Answer 1

a)

If a person weighs 'x' pounds, then the amount of water in them is 60% of 'x', which is equal to y.

So,

y = 60% of x
=> y = (60/100)*x
= 0.6x

Since in this case y changes according to the changes made in x, y is the dependent variable.

b)

You have the equation:
y = 0.6x
Plus in the given input values for x, what values of y do you obtain?

c) The domain refers to all the 'x' values in your table. The range refers to all the 'y' values.