I need help solving these problems. Please show all the work necessary to complete the assignment. So, I can see where I'm failing to solve the task.

4. (6 pts.) Use algebra to find all values of x for which the given product will at least break even: C = 100x + 6000; R = 500x 5. (6 pts.) Solve the system of equations using: (a) the Graphing method, (b) the Substitution method and (c) the Elimination (or Addition) method, labeling each. 3x + 2y =-4 4x - 2y = -10 6. (6 pts.) Graph the feasible region for the system of inequalities. -2xx