math
posted by lisa .
This was the question: Explain why the formula for determining slope using the coordinates of two points does not apply to vertical lines.
The formula for determining a slope using two points does not apply to vertical lines simply because dividing by 0 is not allowedâ€¦undefined. To find a slope of a horizontal line we use the formula m= y1y2/x1x2: this specifies 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 using points (4,5) and (8,5):
m= (5)(5)/ (8)(5) =0/13; undefined
All the points on a vertical line hold the same x coordinate, so x1= x2 and the denominator of the slope formula is zero. For that reason, the slope is undefined because division by zero is not allowed.
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 textâ€ť 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.

math 
lisa
A quick look, I just need to know if this was answered correctly?
Respond to this Question
Similar Questions

algebra
Find the slope of the line through the given points. (2,4) (6,3). m=y2y1 over x2x1. (3)(4) over(6)(2) 34 over 62 7 over 4. I plotted the two coordinates (2,4) (6)(3), and the slope is 7 over 4, right? 
MATH
For the floor plans given in exercise27, determine whether the side through the points (2, 3) and (11, 6) is perpendicular to the side through the points (2, 3) and (3, 18). Compute the slopes of the two lines. If the product of the … 
Math /Algebra
I was challenged with this question: Explain why the formula for determining slope using the coordinated of two points does not apply to vertical lines. This was my answer: The formula for determining a slope using two points does … 
math /algebra
This was the : 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 … 
math
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 … 
Math...Please help I need this done by 6:00
This was the question: Explain why the formula for determining slope using the coordinates of two points does not apply to vertical lines. The formula for determining a slope using two points does not apply to vertical lines simply … 
Geometry
A wooden board is placed so that it leans against a loading dock to provide a ramp. The board is supported by a metal beam perpendicular to the ramp and placed on a 1 ft. tall support. The bottom of the support is 9 feet from the point … 
math
Which statement is true? A. All vertical lines have a slope of zero. B. All vertical lines have a slope positive slope. C. All vertical lines have a negative slope. D. All vertical lines have a undefined slope. WHY? 
Calculus
Draw a diagram to show that there are two tangent lines to the parabola y=x^2 that pass through the point (0,4). Find the coordinates of the points where these tangent lines intersect the parabola. So far I have taken the derivative … 
slope
Find the slope of the line passing through the given points using the slope formula. Enter the slope in simplest form. Describe the slope as positive, negative, zero, or undefined. (8,2) and (15,9) my answer = 1 the slope is posistive