please help with both

7. The following diagram indicates the direct flights among the four cities, A, B, C, and D. Complete the incidence Matrix that Corresponds to the diagram below: Destination A B C D A 0 1 0 0 B 1 Origin B D D do 3. Draw each matrix needed to solve this problem. Solve the following system using Gauss- Jordan Elimination by performing Gauss-Jordan row operations correctly, and drawing a conclusion from the final augmented matrix, and indicate each Row Operation you performed using the correct notation. Show all work on this page. Complete and Correct Work is Required. If there is a solution (using t) describing all possible answers, give that solution correctly (using equations, inequalities). If there is a specific solution where all variables have integer values, find one such specific solution. If there is no solution, explain why there is no solution. Must follow instructions. No Credit for just an "answer". 2x - 4y +z = 3 x - 4y +z = 5