Posted by **Liza** on Wednesday, November 18, 2009 at 7:09pm.

This was the question : Explain why the formula for determining slope using the coordinates of two points does not apply to vertical lines.

This is my answer:The formula for determining a slope using two points does not apply to vertical lines simply because dividing by 0 is not allowed…it is undefined. To find a slope of a horizontal line we use the formula m=y1-y2/x1-x2 this stipulates that we have two points to work with.

Vertical lines are in the form of x=some number, such as x=6; When a line involves an undefined slope the line is vertical, and when a line is vertical you will end up dividing by 0 if you try and evaluate the slope.

Vertical lines have undefined slopes. Thus, the concept of slope simply does not work for vertical lines. A slope of 0=horizontal,

According to page 530 of the text” any two points on a vertical line have the same x coordinate, thus the change in x is always 0, always undefined.

Is this right? If so, do you have any suggestions to make it less wordy and redundant

## Answer this Question

## Related Questions

- Math /Algebra - I was challenged with this question: Explain why the formula for...
- math /algebra - This was the : Explain why the formula for determining slope ...
- math - This was the question: Explain why the formula for determining slope ...
- Math...Please help I need this done by 6:00 - This was the question: Explain why...
- Linear Equation in Two Variables - I have to take a college placement test and ...
- pre calculus - Question 1: Explain why the equation of the line y=5 has a slope ...
- algebra - Find the slope of the line through the given points. (2,4) (6,-3). m=...
- math - Show that the formula for a line through two points (a1,b1) and (a2,b2) ...
- Math - On a grid with points R(-2,-6)& S(3,4), what is the slope of line RS? I ...
- MATH - For the floor plans given in exercise27, determine whether the side ...

More Related Questions