The cost yy (in dollars) to rent a moving van is proportional to the number xx of days that the van is rented. it costs $140 to rent a van for 4 days. write an equation that represents the cost to rent a moving van for xx days.

Step-by-step explanation:

Given : The cost y (in dollars) to rent a moving van is proportional to the number x of days that the van is rented.

It costs $140 to rent a van for 4 days.

i.e. The cost of rent a moving van for 4 days = $140

Then, by unitary method ,

The cost of rent a moving van for 1 day =

Now, the cost for renting a van for x days =

Cost of renting van for one day × (x)

= 35x

Then, the required equation that represents the cost to rent a moving van for x days :

the last choice

step-by-step explanation:

first option

a function is a relation in which an input is paired with exactly one output.

so, let's find the right answer.

in our first option, our inputs are january, february, and march. the outputs are 30, 28, and 25. each input has it's own output. this is correct!

our second option we know is incorrect, because ms. valverade has two outputs, dogs and cats. this is not a function.

our third option is incorrect as well. the yellow square has two ouputs, the square and the triangle.

lastly, in our fourth option, we see the number 7 two times with a different output. therefore, this is not a function.

remember: each input must be paired with only one output!