Answer :

First we determine the slope (m):

[tex]m=\frac{8-1}{1-8}\Rightarrow m=-1[/tex]

Now, using one of the points and using the expression:

[tex]y-y_1=m(x-x_1)[/tex]

We replace the slope (m) and y1 & x1, that is:

[tex]y-1=-1(x-8)\Rightarrow y-1=-x+8\Rightarrow y=-x+9[/tex]

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