The volume V of a gas kept at a constant pressure varies inversely with the temperature T. If the temperature is. 50 degrees, the
volume is 20 cubic feet. What will the volume be when the
Temperature is 100 degrees?
Write an equation representing this scenario? What is the constant of variation? Solve the equation, showing all work for full credit

a 4/6 = 9/12   not proportional

step-by-step explanation:

to find which are not proportional, we can use cross products

if it is true, they are proportional.   if it is not true, they are not proportional.

a 4/6 = 9/12

4* 12 = 6*9

48 = 54

not this is not proportional  

b 2/3 = 12/18  

2* 18 = 3 * 12

36 = 36

this is proportional

c 5/4 = 10/8  

5*8 = 4*10

40 = 40

this is proportional

d 7/5 = 35/25

7*25 = 5 * 35

175 = 175

is proportional

okay..i will pick 8!