Question

If 2x=y then find the value of y?

Answer 1

we know that
sum of linear pair angle is 180.
so
x+y=180
given that y=2x
so
x+2x=180
3×=180
x=60

y=2x=2×60
y=120

Answer 2

Answer:

The value of y is $120^{\circ}$

Solution:

When 2 lines intersect, the linear pair is formed. The sum of linear pair is $180^{\circ}$.

Given $2x=y$ ----- (a)

We know that $x+y=180$ (linear pair sum) ----- (b)

Substituting value of y in (b),

$x+2 x=180$

$3 x=180$

$x=\frac{180}{3}$

$\therefore x=60$

Substituting value of x in (a),

$2 \times 60=y$

$y=120$

The value of y is $120^{\circ}$