Question

PLEASE HELP The No-Crash Rental Company says the total cost to rent a dump truck can be found using the equation y = 45x + 75, where x represents the number of days that the truck is rented.
Please answer these questions:

1. What does the 45 represent in this equation?

2. How much would it cost to rent a truck for 5 days? Please show or explain how you got your answer.

3. How many days could I rent the truck for a total of $480? Please show or explain how you got your answer.

Answer 1

any ideas ?

Answer 2

can you do question 2. ?

Answer 3

well for the first one i thought that 45 represents of how many days to rent to truck but im not sure if thats right and im lost with 2 and 3

Answer 4

the equation is a recipe to find the cost to rent the truck
they tell you x is the number of days.
if you multiply the number of days by 45 you get the cost (after adding an extra 75)

Answer 5

for example, if you rent the truck for 1 day, you replace x with 1 (think of x as placeholder for where to put the 1)
45 * 1 + 75
ist the cost.

Answer 6

to do question 2. , you can use that same idea with x= 5 days

Answer 7

so it would be 45 * 5 + 75 ?

Answer 8

for the second one ?

Answer 9

yes, but simplify to get a single number

Answer 10

remember order of operations, do multiply first

Answer 11

so for number 2 it would be 300 then ?

Answer 12

yes

Answer 13

btw, the answer for 1. is 45 is the cost per day to rent the truck
the 75 is "one-time charge"

Answer 14

ok thats what i figured but wasn't sure

Answer 15

for 3.

start with the equation
y = 45x + 75

look at the question
How many days could I rent the truck for a total of $480?

where does the 480 go in the equation ?

Answer 16

remember, it says
the total cost to rent a dump truck can be found using the equation y = 45x + 75

what does "y" represent ?

Answer 17

wouldn't it represent $480 ?

Answer 18

yes. when they say "total cost" can be found using y = 45x+75
they are saying y is the total cost

for 3. , they tell you the total cost is 480
use that for y, and write

480 = 45x + 75

to "find x" or "solve for x"
I would first add -75 to both sides and simplify.
what do you get ?

Answer 19

ok thank you you been a really big help

Answer 20

and i got nine BTW

Answer 21

@phi