independent, dependent variables, functions, domain, and range

independent- x dependent- y

3/4x-5=y, what is the independent and dependent variable?

The total monthly charge for long distance service

A long distance telephone company charges $4.95 per month and $0.07 per minute for phone calls. What is the dependent variable?

Number of hours worked

A plumber charges $35 to make a house call, plus $25 an hour for labor. The following equation represents c, the total cost of a visit for h hours: c=25h+35 What is the independent variable?

The total cost charged by the driver

A taxi driver charges an initial fee of $2.00 plus $0.30 per mile. What is the independent variable?

the number of hours I study- dependent my grade point average- independent

Consider these two variables. Identify them as either independent or dependent. -the number of hours I study -my grade point average

sales price

During a sale at a shoe store, all shoes were 25% off the original price. What is the dependent variable?

no

Given the points, is this a function? (-1,-2),(1,-1),(1,0),(2,0),(3,2)

yes

Given the points, is this a function? (1,1),(2,2),(3,5),(4,10),(5,15)

time on phone

How much time I spend on the phone effects how much studying I get done. What is the independent variable?

electricity

In the winter, more electricity is used when the temperature goes down, and less is used when the temperature rises What is the dependent variable?

no

Is a circle on a graph a function?

domain-x range-y

Match x and y with domain and range.

purchase price

Sales tax in the state of Maryland is 5% of the purchase price. What is the independent variable?

firefighters

The fire was very big so many firefighters were there. What is the dependent variable?

hour

The height of a candle decreases d centimeters for every hour it burns. What is the independent variable?

number of books read

The number of books I read over the summer depends on how much time I spend at the pool. What is the dependent variable?

pay

To rent a DVD, a customer must pay $3.99 plus $0.99 for every day that it is late. What is the independent variable?

the x repeats

What makes a relation not a function?

dependent variable

a variable whose value depends on that of another

independent variable

a variable whose variation does not depend on that of another