Question 253409: "Plumber Greg came to fix the Brown’s sink. He worked for four hours. The bill for the Browns was $34.59. Then he fixed the Minnick’s septic tank which took him 7 hours. The total bill was $55.23."
What is the independent and dependent variable?
Found 2 solutions by tushki, richwmiller:
Answer by tushki(2)   (Show Source):
You can put this solution on YOUR website! let the independent variable be x and dependent variable be y.
so,
for working 4 hours he earns $34.59 which is equal to x+4y
similarly,
for working 7 hours he earns $55.23 which is equal to x+7y
solve these equations and then you will get the values of x and y
Answer by richwmiller(17219)  (Show Source):
You can put this solution on YOUR website! (Independent variable) causes a change in (Dependent Variable) and it isn't possible that
(Dependent Variable) could cause a change in (Independent Variable).
Ask yourself -
Could the bill (total charges) affect the number of hours or the hourly charge ?
or
Could the number of hours or hourly charge change the total charges (bill) ?
Use in mathematics
In traditional calculus, a function is defined as a relation between two terms called variables because their values vary. Call the terms, for example, x and y. If every value of x is associated with exactly one value of y, then y is said to be a function of x. It is customary to use x for what is called the "independent variable," and y for what is called the "dependent variable" because its value depends on the value of x.[1] Therefore, y = x2 means that y, the dependent variable, is the square of x, the independent variable.[1][2]
The most common way to denote a "function" is to replace y, the dependent variable, by f(x), where f is the first letter of the word "function." Thus, y = f(x) = x2 means that y, a dependent variable, a function of x, is the square of x. Also, in this form, the expression is called an "explicit" function of x, contrasted with x2 − y = 0, which is called an "implicit" function.[1]
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