| The value of K for which the system of equations |
| \[\begin{align} & \,\,\,\,\,\,x+Ky=3 \\ & 11x-77y=87 \\ \end{align}\] |
| has a unique solution, is |
A) \[K=13\]
B) \[K\ne -7\]
C) \[K=87\]
D) \[K\ne 0\]
Correct Answer: B
Solution :
(b): \[\frac{1}{11}\ne \frac{K}{-77}\ne \frac{-3}{-87}\Rightarrow K\ne -7\] and \[K\ne \frac{-77\times 3}{87}\]
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