Plzzz me! i need a good grade! 10 or 20 points!

question 1: which equations, tables, or graphs represent functions? select the three answers that apply.
(use picture for one of the options)

1: which one represents a function? use picture!

2: which one represents a function? y=3x+17 or 20=2x+12

3: which one represents a function? x coordinates are: 16,8,0,-8 y coordinates are: 12,-4,12,28 or x coordinates are: 12,-4,12,28 y coordinates are: 16,8,0,-8?