When you graph using xaxis as q, and yaxis as p (price)
Supply, p=5q^{2}, (you may use a graphic calculator)
the graph is, from the left to right, going down to hit the origin, and up.
Again, when you graph Demand, p = 4800  q^{2}/3,
the graph is, from the left to right, going up to hit the 4800 point on the yaxis (which is p), and coming down.
When the two graphs plotted together, they will meet at the point p=4500, q= 30 (crossing point).
(For the real world, we don't use negative quantity q value which located on the left side of yaxis, so disregard it, and only take the right side of yaxis.)
And, you will see that Supply curve is located under the Demand curve before the cross point, that means more demand, short for the item. After the crossing point, the Supply curve is located on the top of Demand curve, that means more supply, surplus for the item.
Aug 16

Howard L.