How can i determe the value of k such that the system below does not have a unique solution:

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How can i determe the value of k such that the system below does not have a unique solution:

Mathematics
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matrix it up
okay i did that, but now i am stuck as to how to determine it

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im gonna wolf this for simplicity and see if it helps {1,1,k,3},{1,k,1,2},{k,1,1,1}
right, thats what i have, i have no idea how to proceed
http://www.wolframalpha.com/input/?i=rref+%7B1%2C1%2Ck%2C3%7D%2C%7B1%2Ck%2C1%2C2%7D%2C%7Bk%2C1%2C1%2C1%7D
now does it matter if its no or infinite solutions? just a s long as its not unique
it just says, "does not have a unique solution"
from the divisions i see that k not= 1 or -2
how did they get those fractions
they row reduced it
rref form is the row reduced form using elementary matrix operations of row addition and such
click on "show steps"
11k 3 *-1 add to r2 -1-1 -k -3 1 k 1 2 ----------- 0 k-1 1-k -1 11k 3 *-k add to r3 -k -k -2k -3k k 1 1 1 ----------------- 0 1-k 1-2k 1-3k 1 1 k 3 0 k-1 1-k -1 0 1-k 1-2k 1-3k and so forth till you get a diagonal of 1s

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