Zachary Randall
MA 351
Homework #3
6.
> a:= matrix(4, 4, [0, -1, -2, -3, 1, 1, 4, 4, 1, 3, 7, 9, -1, -2, -4, -6]);

> b:=matrix(4, 1, [0, 7, 4, 6]);

> A:=inverse(a);

> x:=multiply(A, b);

w = -6, x = 1, y = 10, z = -7

16.
> a:=matrix(2, 3, [6, -4, b, 3, -2, c]);

> gausselim(a);

c - b/2 = 0
2c = b

17. 
> a:=matrix(3, 4, [1, -2, 5, b, 4, -5, 8, c, -3, 3, -3, d]);

> gausselim(a);

d - b + c = 0
b = c + d