Q. 164.6( 7 Votes )
For what value of x will the lines I and m be parallel to each other?
(i). 
(ii) 
Answer :
(i) x=30
Given l||m
Therefore,
3x – 20° = 2x + 10° [Crossponding angles]
⇒ 3x – 2x = 10° + 20°
⇒ x = 30°
(ii) x=25
Given l||m
Therefore,
(3x + 5)° + 4x° = 180°
⇒ 7x + 5° = 180°
⇒ 7x = 175°
⇒ x = 25°
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