You can put this solution on YOUR website! what is slope of a line that passes throught(1,1)(1,2)
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slope = change in y/change in x
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= (2-1)/(1-1)
= 1/0
which is "undefined".
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If you plot the two points and draw a line
thru the 2 points you will see that you
get a vertical line that contains all of
the points where x = 1.
That is the equationof the "line" and
it has an "undefined" slope.
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Cheers,
Stan H.