Ask Experts Questions for FREE Help !
Ask
    marissa2011's Avatar
    marissa2011 Posts: 1, Reputation: 1
    New Member
     
    #1

    Sep 19, 2011, 01:56 PM
    What if the lines has an undefined slope and no why intercept?
    (7, -8) (7,7) slope: undefined
    Y-intercept: none
    jcaron2's Avatar
    jcaron2 Posts: 986, Reputation: 204
    Senior Member
     
    #2

    Sep 19, 2011, 04:37 PM
    Since the line is perfectly vertical, it's slope is infinite and, as you said, there's no defined y-intercept. Usually equations of lines are written in the form y = mx + b, but in the special case of a vertical line, the equation is written as x = c, where c is a constant. In this case, it would be x = 7. Like any line, it's comprised by all of the points which satisfy it's equation. In this case, all points with x-values of 7 are on the line. Y can be anything, all the way from -infinity to infinity.
    RPVega's Avatar
    RPVega Posts: 29, Reputation: 2
    New Member
     
    #3

    Sep 27, 2011, 10:47 AM
    Point A: (7,-8)
    Point B: (7,7)

    slope = m = rise / run = (y2 - y1) / (x2 - x1)
    m = (7 - (-8)) / (7 - 7) = (7 + 8) / 0 = 15/0 = infinity

    If you try to calculate 15 / 0, on your calculator,
    you will get an error message, because 15 divided by 0
    equals infinity. It's a good thing to remember: all vertical
    lines have an infinite slope, while all horizontal lines
    have a 0 (zero) slope.

Not your question? Ask your question View similar questions

 

Question Tools Search this Question
Search this Question:

Advanced Search

Add your answer here.


Check out some similar questions!

No why intercept, slope undefined [ 3 Answers ]

I'm having trouble helping someone with there homework queation: find the equation of the line that has no y intercept, has an x intercept of 4, and who's slope is undefined y+mx+b since b is y intercept and there is none that is 0 and disappears so next I used the points (4,0) to plug into...

Slope intercept [ 1 Answers ]

I'm having a hard time understanding this portion of my algebra homework. I just can't grasp the concept. Find the equation of the line parallel to y=3x-2 and passing through (3,2). Put your equation in slope-intercept form.

Slope and intercept this is it for now . [ 2 Answers ]

1. Which line is the flattest (or is less steep)? Why? y = 5x -6 y = 5x + 6 y = x - 3 y = x + 3 2. The line y = 4x - 7 crosses the y axis at: (4, 0) (0, 4)

Undefined slope [ 2 Answers ]

If a line has an undefined slope, what can you say about the horizontal coordinates of each of the points on the line?


View more questions Search