Which of the following situations represents a direct variation between x and y? (please help)

Question

A) Dana will travel 150 miles. x=the speed at which dana is traveling. y=the number of hours she will be traveling

B) Jamal earns a fixed pay of 300$ every week. x=the number of hours he works during the week, y=the pay he earns per hour

C) Max earns 10$ for each car he washes x=the number of cars he washes y=the total amount of money he earns

D) the area of a rectangle is exactly 24 square inches x=the length of the rectangle, y=the width of the rectangle.

which of the situations seen above represent a direct variation between x and y

Answer 1

The formula for direct variation is y=kx where k is constant. Next, you have to lay out a formula for each of these scenarios

A) Since distance = rate x time, this is 150 = xy

B) Total pay = hourly rate x number of hours worked, this is 300 = xy

C) Total pay = number of cars you wash x rate per car, this is y = 10x

D) Area = length x width, this is 24 = xy

The one in the correct form for direct variation is C