Question: 3x-5

Comment on 3x-5

I did it a different way. I said the angle above (3x-5) must equal 180 - (3x-5)
Then we can write x + 15 = 180 - (3x-5)
Solve for x. x = 42.5
Will that always work or was it a fluke?
greenlight-admin's picture

That's a great approach.

You first used the fact that angles on a line add up to 180 degrees to determine that the angle above (3x-5) must equal 180 - (3x-5).

Then you used the fact that that angle, 180 - (3x-5), must equal the other angle x + 15.


Have a question about this video?

Post your question in the Comment section below, and a GRE expert will answer it as fast as humanly possible.

Change Playback Speed

You have the option of watching the videos at various speeds (25% faster, 50% faster, etc). To change the playback speed, click the settings icon on the right side of the video status bar.

Let me Know

Have a suggestion to make the course even better? Email us today!

Free “Question of the Day” emails!