Question

What is the value of x?

a)20
b)35
c)60
d)70

Answer 1

x is equal to 20, or the answer A

Explanation:

They are opposite angles so they are equal to each other. When you set up the equation (x+40)=3x, you get the answer to be 20. hope this helped!

Answer 2

For this case we have to define by opposite angles the vertex that:

`x + 40 = 3x`

Subtracting 3x on both sides of the equation:

`x-3x + 40 = 0\\-2x + 40 = 0`

Subtracting 40 from both sides of the equation:

`-2x = -40`

Dividing between -2 on both sides of the equation:

`x = \frac {-40} {- 2}\\x = 20`

So, we have that
`x = 20`

ANswer:

`x = 20`