Examine the graph of the line at right.  

1. Find the slope of this line using slope triangle $A$.

   Hint (a):

   How do you find the slope of a line?

2. Find the slope using slope triangle $B$.

   Hint (b):

   See part (a).

3. Without calculating, what does the slope ratio for slope triangle $C$ have to be?

   Hint (c):

   If the triangle is on the same line, what does that tell you about the slope?