Answer:
We are given that 4 lb of candies are bought for $9.00
Therefore, the price of 1 lb of candies is:

Now the amount of candies that can bought for $12.00 is:
lb
Therefore, 5.3333 lb of candies can be bought for $12.00
The sign of each Y coordinate changed
Answer:
x - 2y - 5= 0
i think is the answer for number 1 i hope it is