Which two angles form a linear pair?

Question

Use the following figure to answer the question.

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Which two angles form a linear pair?

Enter your answer as the two angles that correctly answer the question, separated by a comma, like this: 42, 53

Is 1,2 an linear pair?

Answer 1

I see 6 sets: 2,1

3,blank

4 and 5,6

3,4 and 5,6,blank

2 and 3,4

1 and 5,6,blank

Answer 2

A linear pair of angles are two adjacent angles that are complementary - i.e. form a line.

1, 2