Question

Which of the following is sufficient to establish that wxyz = 0?

Answer 1

w=y-z
xz=0
xy-yz=0
wx=zy

Answer 2

hint:
wxyz = 0
is the same as
(wy)*(xz) = 0
after you rearrange a few terms

Answer 3

So b? Or d?... I'm still a little confused

Answer 4

if (wy)*(xz) = 0, then either factor is zero (or both could be 0)

Answer 5

if A*B = 0, then either A = 0 or B = 0 (or both are zero at the same time)

Answer 6

SO I guess B?

Answer 7

yes wy = 0 or xz=0

Answer 8

0 times anything is 0