Solve for X: Finding Angles in Parallel Lines with X+20° and 2X°

Question

What is the value of X?

00:00 Find X

00:03 The lines are parallel according to the given information

00:10 Corresponding exterior angles are equal between parallel lines

00:14 We'll substitute appropriate values in the equation and solve to find X

00:18 Isolate X

00:26 And this is the solution to the question

Since alternate angles are equal between parallel lines, they are equal to each other.

Therefore we can say that:

$x+20=2x$

We will move X to the right side and keep the plus and minus signs accordingly when making the change:

$20=2x-x$

$20=x$

X=70