Question

Two parallel lines are crossed by a transversal.

Answer 1

Answer: y = 50 degrees

Answer 2

Answer: y= 50

Step-by-step explanation:

The angles that are formed  inside the two lines and on opposite sides of the transversal are known as alternate interior angles.

Consider the given figure , we can see that line b and line c are intersected by  a transversal so by the definition of alternate interior angles,

The alternate interior angles formed = $y^{\circ}$ and  $50^{\circ}$

Since we are given that two parallel lines are crossed by a transversal.

Then the alternative interior angles must be congruent.

$\Rightarrow\ y^{\circ}=50^{\circ}$

Hence, the value of y= 50