Given the vector a = (1, K) and the vector b = (9, K-5), if a is parallel to B, then the real number k is equal to?

If a is parallel to B, we can get a = XB
The solution of 1 = 9x is: x = 1 / 9
K = (K-5) x is substituted into x solution to get k = - 5 / 8

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