Which relation is a function?

Chandler was a caretaker at the state zoo. he noticed that the number of animals adopted by the zoo increased at a constant rate every year since 2010. which of the following graphs shows the slowest rate at which the animals in the zoo were adopted?

Graph the equation by plotting point x=2

Give the equations of two different lines that are perpendicular to the line 3x + 4y = 7.