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# Measures of angles formed by a transversal

Sal solves an equation to find missing angles given two parallel lines and a transversal. Created by Sal Khan.

## Want to join the conversation?

• I'm a little confused as to how I to set the equation, I set it up as 9x + 88 = 6x + 182 I took the 6x away from the left side and misused the 88 on the right, so I was then left with 3x = 93, I divided each side by three and ended up with 31.333, is there a way to know how to set it up from the beginning in the correct order? Or did i do my math wrong? (Would like to add I set it up the other way as well and figured it out right away) (6x + 182= 9x +88)
• It should be 9x + 88 + 6x + 182 = 180 because those angles are supplementary - they add up to 180 degrees.
• I'm learning this while still in 7th grade why? bc of the shsat exam
(1 vote)
• one of my favorite things to do is look through some of these old khan academy comments
• Same the things they right are funny
• i sold my wife to pay for my xbox gamepass subscription
• you bum
• This hurts my brain.
• this is ez
• Cheers to those who got the answer at the pause ^-^
• But how does 15x + 270 = 180?
It doesn't make sense!
• Well, remember that x can be any number - including, vitally, a negative number - and I think it'll begin to resolve itself.
(The answer, if you're interested, is x = -6. 15 * - 6 = -90; 270 - 90 = 180.)