Q21 of 45 Page 1

Find the angle between the following pair of lines:

and


and check whether the lines are parallel or perpendicular.

Comparing the equations of lines, against the required variables,


A1 = 2, B1 = 7 & C1 = -3


A2 = -1, B2 = 2 & C2 = 4





= 0




Checking for perpendicularity,


A1(A2) + B1(B2) + C1(C2)


= 2(-1) + 7(2) + (-3) (4)


= -2 + 14 – 12


= 0


The lines are perpendicular.


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