Statement 1: If two angles form a linear pair, then they are supplementary angles. Statement 2: If two lines intersect in one point, then exactly one plane contains both lines.

Which geometry term does each statement represent?

Cause of he different elevations  hope this ?

1. why do astronomers think that there may be other advanced civilizations?
because  it was discovered that there are other planets like earth out there, able to  accommodate life forms.
2. what technologies are astronomers using to look for life on other planets? why?  
they  have used radio telescopes, but now they use laser telescopes   to track laser communications.

Could you post a picture of the number line?