I believe the answer is 10.362
hope this helps
Rise over run is -2/4 or simplified as -1/2
The second one is
Answer:

Step-by-step explanation:
we know that
A relationship between two variables, x, and y, represent a direct variation if it can be expressed in the form
or 
In this problem we have
y=18 when x=2
Find the value of the constant of proportionality k
----> 
therefore
The equation is equal to

40 bikes. 120 times 40 equals 4800 divided by 2 because they pay for half the bike will be 2400
3=−(−y+6)
Simplify:
3=−(−y+6)
3=y+−6(Distribute)
3=y−6
Flip the equation.
y−6=3
Add 6 to both sides.
y−6+6=3+6
y=9