Defining variables

In order to join an online learning community, there is a $20 startup fee and a $5 monthly fee. What could the equation look like?

• y = 5x + 20

• y = 20x + 5

• 20x + 5y = c

• 20x = 5y

• 20y = x + 5

In order to join an online learning community, there is a $20 startup fee and a $5 monthly fee. What could we use to define x?

• cost per month

• number of months

• cost for start up

• 5

• total cost

In order to join an online learning community, there is a $20 startup fee and a $5 monthly fee. What could we use to define y?

• cost per month

• number of months

• cost for start up

• 20

• total cost

Suppose that a bike rents for $4 plus $1.50 per hour. Write an equation in slope-intercept form that models this situation.

• y = 4x + 1.50

• y = 1.50x + 4

• y = -4x +1.50

• y = 4x - 1.50

Suppose that a bike rents for $4 plus $1.50 per hour. What could we use to define x?

• cost per hour

• number of hours

• total cost

• 1.50

• 4

Suppose that a bike rents for $4 plus $1.50 per hour. What could we use to define y?

• cost per hour

• number of hours

• total cost

• 1.50

• 4

An airplane 30,000 feet above the ground begins descending at a rate of 2,000 feet per minute. Write an equation to model the situation.

• y = - 2,000x + 30,000

• y = - 2,000x - 30,000

• y = 30,000x + 2,000

• y = -30,000x + 2,000

An airplane 30,000 feet above the ground begins descending at a rate of 2,000 feet per minute. What could we use to define x?

• number of minutes

• 2000

• 30000

• total feet above ground

• feet per minute

An airplane 30,000 feet above the ground begins descending at a rate of 2,000 feet per minute. What could we use to define y?

• number of minutes

• 2000

• 30000

• total feet above ground

• starting amount

Daniel went to a fruit market where he found that oranges cost $4 per pound and bananas cost $2 per pound. He bought some oranges and bananas and the total cost was $28.

What could we use to define x?

• cost of oranges

• total cost

• number of pounds of oranges

• 4