3. Suppose the vertices of the graphs whose incidence matrices are shown in Figure 2 are labeled a, b, c, and that the rows of the matrices represent vertices of the graphs and the columns represent edges. Assuming that these matrices were generated using the conventions that were discussed in class, draw the graph represented by each matrix. 1 1 -1 1 00 -1 00 0 -10 0 -1 1 0 11 0 00-1 0-1 5 -7 0000 -5 0 3 8 -2 0 0 0-30 0 3 0 7 0 -8 23 Gi- W, Figure 2: Incidence Matrices of Two Graphs (a) Draw G1. [10 points] (b) Draw G2. [15 points]