k for which two linear equations have no solution

The same question, asked 2 times: 10 Sep 2024 S3*, 17 Sep 2024 S1. Every wording below, oldest first.

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Question 1
10 Sep 2024 S3
70 $2x + 7ky - 8 = 0$
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Question 2
17 Sep 2024 S1
65 $For what value of k, the system of equations kx - 15y + 7 = 0 and 7x - 21y - 19 = 0 has NO solution?$
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