Respuesta :

matthewdickin
Correct! lines that have undefined slopes are always parallel to the y-axis as the change in x is 0. A gradient is calculated by  the change in y divided by the change in x and anything divided by 0 is referred to as undefined.
 
[tex] \frac{y_{1}- y_{2} }{x_{1}- x_{2} } [/tex]

(calculation for a gradient)


Hope that helps sorry if its a bit confusing :)

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