Which relation is a function of X? Why did I get this wrong? Can I please get an explanation of why I got this wrong and what I need to do next time too get it right

Listed in the table is the percentage of students who chose each kind of juice at lunchtime. use the table to determine the measure of the central angle you would draw to represent orange juice in a circle graph

Need on this one asap im almost done with this subject

What is the equation of this graphed line? enter your answer in slope-intercept form in the box.