Posted by barb on Sunday, August 22, 2010 at 9:21pm.
find the slope of the line, if it exists:
coordinates are (1,5), (1,5)
I am doing something wrong because I either get 5 or if I work it another way I get 0
m= either 5 or 0
Which one is it if any?
x1x2/y1y2
Can you please help me through this?

math  MathMate, Sunday, August 22, 2010 at 9:34pm
The slope of a line through two given points P1(x1,y1) and P2(x2,y2) is given by the expression:
m=(y2y1)/(x2x1)
Since y2=y1, so y2y1=0.
Next we have to check if the slope exists:
(x2x1)=1(1)=2 ≠ 0.
Therefore m=0/2=0.
Note: if y2=y1 and x2=x1, then P1 and P2 are two coincident points, and the slope does not exist, because we cannot define a line through two coincident points.
Answer This Question
Related Questions
 College Math  2008 (2nd)Course24.1 We are to find a function f(x) such that ...
 Math  x=33y x+3y=6 I'm looking for coordinates of where the two lines ...
 Algebra HELP!!  Write the equation of the line that contains the points (2, 2) ...
 Algebra  Write the slopeintercept form of an equation for each line, given ...
 math 8th!  point A (2,3) lies on a line with a slope of 2. Describe how to ...
 math  When determining the slope of a line, what is the correct way to leave ...
 math CAN SOMEONE PLEASE HELP  find the two ordered pairs of this equation. y=5...
 slope algebra  given ab and its midpoint m. the coordinates of a are (10,3) ...
 Math  On a grid with points R(2,6)& S(3,4), what is the slope of line RS? I ...
 algebra  Find the slope of the line through the given points. (2,4) (6,3). m=...
More Related Questions