The system of equations is given:
1.2x + 3y − 5z + 4.2w + v = 0
6x = 5y + 2w
3y + 4.5z − 6w + 2v = 10
9x − y + z + 2v = −3
−4x + 2y − w + 3v = 1
a. Represent this system using a matrix equation.
b. Use technology to solve the system. Show your solution process, and round your entries to the tenths place.