Teaching HTET PGT Level 3 - 2024 Mock Test Mathematics Lines

If the lines y + px = 1 and y - qx = 2 are perpendicular, then which one of the following is correct?

1
pq + 1 = 0
2
p + q + 1 = 0
3
pq - 1 = 0
4
p - q + 1 = 0
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