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The point-slope form if the coordinates are (-1,1) and (1,-1)
[tex] \frac{ - 1 - 1}{1 - ( - 1)} = \frac{ - 2}{1 + 1} = \frac{ - 2}{2} = - 1[/tex]
y = ax + b = ( - 1 )x + b = - x + b < i guess>
Ok done. Thank to me :>