帮手解答吧！大学数学题！
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(a)
if ad-bc=0, in other terms, the determinant of this matrix M is nonzero,
thus, the inverse of this matrix exists, and the rank of the matrix is 2
we denotes the inverse of M is M'(we get it by gaussian elimination), s.t. M*M'=I(identical matrix)
so, if we use gaussian elimination, we will get the reduced row echelon form as an identical matrix
(b)
the linear system can be rewritten as follows:
by applying gaussian elimination, we will get an reduced row echelon as follows:
it clearly gets only one solution:
[x,y]=[m,n]
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