Posted by **Sofie** on Wednesday, April 20, 2011 at 3:02pm.

Lines x and y intersect to form angles 1,2,3, and 4. The measure of angle 3 is (3x - 9) and angle 4 is 111 degrees.

Can you help me make a equation

I think the equation is 3x-9 + 11 = 180

is this correct

- Math(can you just check my answer please) -
**MathMate**, Thursday, April 21, 2011 at 8:41am
Implied in the question is that angles 1,2,3,4 are in either clockwise or counter-clockwise order.

If that is true, then angles 3 and 4 are adjacent and supplementary (add up to 180°).

The proposed equation is correct *if the two angles are adjacent*:

3x-9 + 11**1** = 180

(note correction in typo).

- Math(can you just check my answer please) -
**Michelle**, Friday, November 16, 2012 at 4:04pm
¡çLMN and ¡çNMO are adjacent angles that share MN

ƒåƒåƒåƒåƒâ

as a side. Together, those two angles form ¡çLMO.

What equation can you write that shows the relationship between m¡çLMN , m¡çNMO , and m¡çLMO

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