Emily is saving up to buy a new phone. She already has $75 and can save an additional $7 per week using money from her after sch
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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.
(calculation for a gradient)
Hope that helps sorry if its a bit confusing :)
(calculation for a gradient)
Hope that helps sorry if its a bit confusing :)