Please help with question in photo below, its about independent and dependent variables.

Answer:
a)independent variables: 3,4,5,3,7,8 dependent variables: 27,36,45,54,63,72
b) y=9x
Step-by-step explanation:
Your independent variables are what is on your x- axis so in this case, it's the number of guests, Your dependent variables are on your y- axis so it's the meal preparation. Since for each guest there is a 9 min prep time (27/3=9 or 36/4=9 equals 9 and so on) your equation to compare them is y=9x