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In the given figure, if the lines l1 and l2 are parallel to each other, and the transversal line m intersects it. What is the value of y?
  • a)
    52° 
  • b)
    78°
  • c)
    128°
  • d)
    138° 
  • e)
    168°
Correct answer is option 'C'. Can you explain this answer?
Verified Answer
In the given figure, if the lines l1 and l2 are parallel to each other...
Step 1: Question statement and Inferences
We are given that two parallel lines l1  and l2  are intersected by a transversal line m. Also, the angles formed are shown as 2x, 3x + 50, a, b, and y.
We have to find the value of angle y.
Now, to find the value of y, we need to establish the relation between x and y. Since the lines l1 and l2 are parallel lines and the transversal line m intersects them,
2x = a       (Corresponding angles)
Also, since
a = b   (Vertically opposite angles)
Hence,
b = 2x
 
Also,
(3x + 50) + a = 180º
(3x + 50) + 2x = 180º 
5x + 50 = 180º   
5x = 130º 
x = 26º         ……………………… (1)
 
Step 2: Finding required values
Now, we know that the sum of all the angles formed around a point is 360o . So,
a + b + (3x + 50) + y = 360º 
Thus,
2x + 2x + y + y = 360º 
7x + y + 50 = 360º   
7x + y = 310º    …… (2)
 
By putting the value of x from equation (1) to equation (2), we get:
7*26 + y = 310º   
182   + y = 310º 
y = 128º 
Step 3: Calculating the final answer
So, the value of y = 128º 
Answer: Option (C)
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In the given figure, if the lines l1 and l2 are parallel to each other, and the transversal line m intersects it. What is the value of y?a)52°b)78°c)128°d)138°e)168°Correct answer is option 'C'. Can you explain this answer?
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