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Could you explain it a little more? I don't really understand..

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Other answers:

|dw:1359930331078:dw|
The two angles I marked are called vertical angles. Vertical angles are congruent. That means they have the same measure. |dw:1359930401555:dw|
Since the measure of one angle is 3x - 40 and the other one is 2x - 10, and the measures are equal, that means 3x - 40 = 2x - 10 If you solve this equation, you get the value of x.
Do you follow so far?
Yes, so it's 3x - 40 = 2x - 10 +40 +40 3x = 2x + 30 -2x -2x x = 30 Is that right?
Good. Now since the measures of one angle is 3x - 40, and x = 30, what is the measure of the angle?
No wait, sorry it's 3(30) - 40
|dw:1359930857941:dw|
so that's 50 degrees?
right
|dw:1359930986373:dw|
y would equal 130 degrees
Correct, and that's what you are looking for.
Awesome! Thank you so much :D It looked so complicated o.o
If you break down the problem into simple steps, it's not that complicated. You're welcome.

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