39. you need to rent a car for a trip. wrecko'mend charges $. 10 a mile plus a $30 flat fee. rent a wreck
charges $20 a mile with no fee. how many miles does the trip have to be for wrecko'mend to be the better
deal?

i think this is a systems of equations

putting this on a graph we have to equations:

y = 10x + 30

y = 20x

graph and find the intersection.

it has to be more than or equal to 3 miles i think for wreckomend

1.4

2.3

step-by-step explanation:

the formula for the constant of variation is

y= kx

divide each side by x

y/x =kx/x

y/x =k

we know a and y

1.   y/x = k

4/1 =4

check the other values to make sure they are the same

8/2 = 4   12/3 =4   and 16/4 =4  

the constant of variation is 4

2.   y/x = k

3/1 =3

check the other values to make sure they are the same

6/2 = 3   9/3 =3   and 12/4 =3  

the constant of variation is 3

in simplified version   it would be x ≤-4

step-by-step explanation:

multiply each term in x ≤-4 by -1