Which of the following situations is the proportional relationship?

What is the answer to this problem 7 * 5/6

(note i put the graph in so plz )the graph shows the amount of water that remains in a barrel after it begins to leak. the variable x represents the number of days that have passed since the barrel was filled, and y represents the number of gallons of water that remain in the barrel. what is the slope of the line

Can someone check if i did this right since i really want to make sure it’s correct. if you do you so much