For the following three graphs, (a) compute the sum of the degrees of all the vertices, and (b) count the number of edges. Look for a pattern for how the answers to (a) and (b) are related.

(a) Sum of degrees of first graph =
(b) Number of edges of first graph =

(a) Sum of degrees of second graph =
(b) Number of edges of second graph =

(a) Sum of degrees of third graph =
(b) Number of edges of third graph =