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Question 687065: Use Cramer's rule to solve the system of equations. If D = 0, use another method to determine the solution set.
x + y + z = 9
2x - 3y + 4z = 7
answers:
Cramer's rule does not apply since D = 0; cant be done
Cramer's rule does not apply since D = 0; z+34/5, 2z+11/5,5
Cramer's rule does not apply since D = 0; -7z+34/5, 2z+11/5,5
Cramer's rule does not apply since D = 0; -7z+34/5, 2z-11/5,5
My final answer was D. I don't think it is correct though I was confused. Can somone please show me their steps and the correct answer?
Answer by jim_thompson5910(35256)   (Show Source):
You can put this solution on YOUR website! x + y + z = 9
2x - 3y + 4z = 7
has this coefficient matrix
but this matrix is NOT square. So the determinant cannot be computed, which means that you can't use Cramer's Rule here.
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