Which sequences is not equivalent to the others

Which coefficient matrix represents a system of linear equations that has a unique solution ? options in photo*

Find solution of the linear equation y = 2/3x + 1/3

Solve: 25 points find the fifth term of an increasing geometric progression if the first term is equal to 7−3 √5 and each term (starting with the second) is equal to the difference of the term following it and the term preceding it.