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equestriangirl131
Supplementary angles will always add up to 180. If you had a straight line, and you drew another line across that line, the two angles on either side of that line would add up to 180 because a flat line is equal to 180 degrees.

Answer:

m∠L + m∠M = 180 degrees

Step-by-step explanation:

Supplementary angles add upto 180 degrees.

Since angles L and M are supplementary, the sum the two angles must be 180 degrees.

m∠L + m∠M = 180 degrees

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