Yes, they are.
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supplementary can sure be a linear pair. As long as their is 2 different angles and they equal 180 degrees.
True only if the two angles are adjacent (i.e. have a point in common). By definition, supplementary angles add up to 180° therefore they are linear pairs, if they are adjacent. Otherwise false. Imagine drawing an angle of 40° at the top of the page and another of 140° at the bottom. These angles are supplementary but not a linear pair.
They are supplementary
Yes, they will always form a linear pair because supplementary means 180 degrees.
supplementary