Question 1107409
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..., through a point -1, 4 and 1,2
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You mean pointS  (-1,4) and (1,2).
The slope for those two points:  {{{(2-4)/(1-(-1))=-2/2=-1}}}.


THE line with slope {{{2}}} will not pass through both points  (-1,4) & (1,2).