3. two car washes charge a basic fee plus a fee based on the number of extras that
are chosen. the table below shows the total costs for different car washes at
bubbles car wash. the total cost y (in dollars) for a car wash with x extras at
soapy car wash is represented by the equation y = x + 9. which car wash
charges more for the basic fee? how many extras must be chosen for the total
costs to be the same?
number of extras, x2
total cost, y
9
12
15
18

the direct variation says that:

then the equation is of the form is given by:

            where k is the constant variation.

from the given table:

consider any value of x and m(x)=y

x = 2 and m(x)=y = 3

substitute these value in [1]; we have;

divide both sides by 2 we get;

⇒

check:

put x = -1 and m(x) = -1.5

substitute in the equation:

-1.5 = -1.5                   true

therefore, the function m(x) represents a direct variation

graph of this function as shown below:

the answer will be the last one

b i think

step-by-step explanation:

not really sure

i think it will be zero as slope has a formula of difference between initial and final distance divided by itz time interval