Solve the following systems of equations, using the a\b construct, as well as the gauss-seidel method with a tolerance of 10^(-7) (in some cases convergence may not occur).

a) 2x1 − x2 + 3x3 = 8

4x1 + 2x2 − 5x3 = −9

6x1 + 3x2 + x3 = 12

b) 10x1 + x2 + 2x3 = 3

x1 + 10x2 − x3 = 1.5

2x1 + x2 + 10x3 = −9

Alex’s family members live in different parts of the world. they would like to discuss the wedding plans of one of their distant relatives. however, alex wants all the family members to talk to each other simultaneously so that they can make decisions quickly. which mode of internet communication should they use? a. blog b. email c. wiki d. message board e. instant messaging