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## Main Question or Discussion Point

Hey

Im having trouble of how to go about this. Afterwards we have to perform some Cramers rule operations however I am currently struggling. For:

Find all values of s and t for which the following system has a unique solution:

sx1 + 2x2 + x3 + 3x4 = 1

tx1 + x2 + 3tx3 + s^2x4 = 0

sx3 + 2tx4 = 2

x3 + x4 = 1

Do I just say that (s/2)=/1 and t=/1 because of the last two equations or is there more to it?

Thanks

Im having trouble of how to go about this. Afterwards we have to perform some Cramers rule operations however I am currently struggling. For:

Find all values of s and t for which the following system has a unique solution:

sx1 + 2x2 + x3 + 3x4 = 1

tx1 + x2 + 3tx3 + s^2x4 = 0

sx3 + 2tx4 = 2

x3 + x4 = 1

Do I just say that (s/2)=/1 and t=/1 because of the last two equations or is there more to it?

Thanks