A graph shows the relationship between the area of a square on the x-axis and the length of its side on the y-axis. Which statement is true about this graph?
As the area increases, the side length increases proportionally.
As the area increases, the side length increases in a non-proportional manner.
As the area increases, the side length decreases proportionally.
As the area increases, the side length decreases in a non-proportional manner.