Answer:
-1y or -y
Step-by-step explanation:
8-9 =-1
substtute for y and there ya go
Answer:
D. 150 pounds
Step-by-step explanation:
For be directly proportional, it has to be that as one value increases the other does it equally, so
If 138 pound box has a volume of 23 gallons for 25 gallons ?. For being directly proportional tha value must be higest
138 → 23 
x → 25
The number pi is a constant, it's the ratio of a circles circumference to it's diameter.