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Question

For what value of k, the system of equations x + 2y = 5, 3x + ky + 15 = 0 has no solution?


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Solution

We have,

x + 2 y – 5 = 0 and 3 x + k y + 15 = 0.

The required condition for no solution is a1a2=b1b2c1c2

13=2k515

k = 6 & 2k13

k = 6 and k ≠ –6

Hence the given system of equations will have no solution when k = 6.


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