Question

Help me? answers por favor ?

Answer 1

The answer to 21 is Never true because a supplementary angle always adds up to 180 degrees and obtuse angles are angles MORE than 90 degrees and 91 + 91 wouldn't make it supplementary.

Answer 2

Please, post only one question at a time.

The line passing through (1,4) and (-4,-1) has the following slope:

          -1 - 4          -5
m = ------------ = -------- = +1
          -4 - 1          -5

Find the slope of the line passing thru the other set of points.  Graph both lines.  What do you see?  Do the 2 lines have any particular relationship to one another?