Sunday

April 20, 2014

April 20, 2014

Posted by **barb** on Sunday, August 22, 2010 at 9:21pm.

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?

x1-x2/y1-y2

Can you please help me through this?

- math -
**MathMate**, Sunday, August 22, 2010 at 9:34pmThe slope of a line through two given points P1(x1,y1) and P2(x2,y2) is given by the expression:

m=(y2-y1)/(x2-x1)

Since y2=y1, so y2-y1=0.

Next we have to check if the slope exists:

(x2-x1)=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.

**Related Questions**

math/algebra - find the slope if it exists, of the line containing the pair of ...

algebra - Find the slope of the line through the given points. (2,4) (6,-3). m=...

slope algebra - given ab and its midpoint m. the coordinates of a are (-10,-3) ...

Math 116AA - find the slope if it exists of the line containing the pair of ...

math - how do i find the slope of line AB if A`s coordinates are(-4,3) and B`s ...

Algebra - Find the slope of any line perpendicular to the line through the ...

math - graph the line with slope 1/2 passing through the point(-5,-2) find the ...

pre calculus - Question 1: Explain why the equation of the line y=5 has a slope ...

Graph problems!!! - Ok. so i'm supposed to find the coordinates of a line using ...

math - find the equation (in slope intercept form) of the line with the given ...