| Find the values of p so that the lines | 1 | 7 | 14 | 3 | |---|---|---|---|---| 3 2 2 | x | y | z | |---|---|---| p / − − − = = | and | 7 | 7 | 5 | 6 | |---|---|---|---|---| 3 1 5 | x | y | z | |---|---|---| p − − − = = are at right angles.

Question

| Find the values of p so that the lines | 1 | 7 | 14 | 3 |
|---|---|---|---|---|
3 2 2
| x | y | z |
|---|---|---|
p / − − − = =
| and | 7 | 7 | 5 | 6 |
|---|---|---|---|---|
3 1 5
| x | y | z |
|---|---|---|
p − − − = =  are at right angles.

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Question 10