Use matrix inversion to solve each collection of systems of linear equations. HINT [See Example 4.](a)

x		4y	+	2z	=	13
x				z	=	5
x	+	y		z	=	9

(x,y,z) =

(b)

x		4y	+	2z	=	8
x				z	=	3
x	+	y		z	=	2

(x,y,z) =

(c)

x		4y	+	2z	=	0
x				z	=	0
x	+	y		z	=	0

(x,y,z) =