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Use the formula for slope to verify that a horizontal line has a slope of zero and that a vertical has an undefined slope. I have no idea what to do can some one help explain it to me thanks. :)

Mathematics
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The slope of the line through points (x1,y1) and (x2,y2) is given by : \(\huge m=\frac{y_1-y_2}{x_1-x_2}\) now horizontal line has equation of the form y=c, here xterm has '0' co-efficient take any two points on this, say (x1,c),(x2,c) so put y1 = c and y2 = c in m and tell me what u get.
i'm sorry i don't get what the y = c part ??
i'll draw a horizontal line|dw:1348817053391:dw| can u see that y-co ordinate of every point on that line is same??

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Other answers:

yes
that means for any value of x-coordinate , y co-ordinate will be some constant 'c' only.....so we can write its equation as y=c got this?
i think so the y will stay the same ( constant) meaning y = c ??
yup. similarly for vertical line , the equation is x=c
i don't get the x=c part ??
|dw:1348817443207:dw| can u see that x-co ordinate of every point on that vertical line is same
one is smaller than the other ??
so they are not really the same ??
for a vertical line, x co-ordinate always remains constant. hence its equation can be written as x=c did u understand this?
yes i think i kind of get what what you are saying
now reply to my first comment

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