SOLUTION: For a homework assignment, I have to "find the slope of the line through each pair of points". The first example is (19, -16), (7,-15). I don't know where to start. Please help, a

Algebra ->  Linear-equations -> SOLUTION: For a homework assignment, I have to "find the slope of the line through each pair of points". The first example is (19, -16), (7,-15). I don't know where to start. Please help, a      Log On


   

Question 389163: For a homework assignment, I have to "find the slope of the line through each pair of points". The first example is (19, -16), (7,-15). I don't know where to start. Please help, and thanks in advance.
Jim Dunlap
Answer by jim_thompson5910(35256) About Me  (Show Source):
You can put this solution on YOUR website!
Note: is the first point . So this means that x%5B1%5D=19 and y%5B1%5D=-16.
Also, is the second point . So this means that x%5B2%5D=7 and y%5B2%5D=-15.


m=%28y%5B2%5D-y%5B1%5D%29%2F%28x%5B2%5D-x%5B1%5D%29 Start with the slope formula.


m=%28-15--16%29%2F%287-19%29 Plug in y%5B2%5D=-15, y%5B1%5D=-16, x%5B2%5D=7, and x%5B1%5D=19


m=%281%29%2F%287-19%29 Subtract -16 from -15 to get 1


m=%281%29%2F%28-12%29 Subtract 19 from 7 to get -12


m=-1%2F12 Reduce


So the slope of the line that goes through the points and is m=-1%2F12