line drawing dda algorithm for negative slope and slope magnitude greater than 1?(left to right)?

pls help how to derive this.

i have derived all other cases but this one is confusing.

m= del y /del x

then

since m>1 so let del y =1

and substituting values...

x_k+1 = x_k + del x

y_k+1=y_k+del y...and so on..

but this is not producing the right results as given in my book.

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