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+#Example 2.5,section 1.2,page 15
+#package used matlib v0.9.1
+#install package using command: install.packages("matlib")
+#Github reposiory of matlib :https://github.com/friendly/matlib
+
+#installation and loading library
+#install.packages("matlib")
+library("matlib")
+
+#program 
+A <- matrix(c(1,2,3,2,0,2,0,1,1,0,0,-1),ncol = 4)
+b <- c(1,2,4)
+Ab <- cbind(A,b) #augmented matrix
+Ab <- rowadd(Ab,1,2,-2)
+Ab <- rowadd(Ab,1,3,-3)
+Ab <- rowadd(Ab,2,3,-1)
+Ab
+#The leading variables are x, y, and w. The variable z is free.
+#although there are infinitely many solutions, the value of w doesn't vary but is constant w = -1.
+\ No newline at end of file