In part one you will need to compose the three equations
Part 2 you will need to decompose the answer you got for the first part. A, B , and C should be part of the system. Separate the equation into a,b and c. Get the common denominator. Remember to foil before you distribute the letters. Combine like terms and set them equal to the corresponding term
For the third part you will need to put in in matrix form, don't worry you wont need to solve the matrix. Plug it in into your calculator and use the reff button. You should get the numbers you started with.
Plug in what you got on the solved matrix back to the three equations you started with. You should have the same equations.