Q. 18

# Show that the lin

Given : the lines and .

To prove : the lines are at right angles.

Formula used : If the lines are = = and = = then the angle between the lines ‘θ’ is given by

θ = The lines and .

Here p = 7 , q = -5 , r = 1 and l = 1 , m = 2 , n = 3

θ = = θ = = = 90°

θ = 90°

The Lines and are at right angles.

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