Consider the system of equations
![1648_6974d0ae-f159-47df-a3a1-54e8e976dd18.png](https://secure.tutorsglobe.com/CMSImages/1648_6974d0ae-f159-47df-a3a1-54e8e976dd18.png)
(a) Using the rref command on your calculator, determine the conditions on the coefficients in order for there to be a unique solution.
(b) Visualizing each equation as being a three dimensional plane, give a geometric interpretation of this condition.