It is B because 40x32=1280 and 5x4=20 then divide 1280 by 20 and you get 64 but you can’t have 64 so you would need to only have 60 so the answer is B
#3 is not a function because there are two answers for one out put
#4 is a function because it is a straight line
If pounds was x
a. 0.65x is the equation.
2 pounds would cost $1.30
b. 0.65x-0.05x is the equation.
Answer:

Step-by-step explanation:
Use the two-point form of the equation of a line.





So we are given the following system:

Using the first equation again we get: