3. A 100 1b crate weighing W = 100 1b is pushed against an incline (0 = 30") with a force of Fa =30 1b as shown. The forces Fr and N satisfy the following system of equations: 0.866 Ff - 0.5N + 30 = 0 0.866N+0.5Ff-100=0. Fa W - X a) Write the system of equations and in the matrix form Ax = b, where x= Ff . N. In other words. find matrices A and b. b) Find Fr and N using the matrix algebra method. Perform all matrix computation by hand and show all steps. c) Find Fr and N using Cramer's rule.3. 0.866 -0.5 30 - (a) 0.5 0.866 1 = [ 110 (b) F =24.0 1b, N = 101.6 lb (c) F = 24.0 1b, N = 101.6 1b