plot the point (-4,1)
to get a slope of -1 , you could go up 4, the left 4,
(or up 10, then left 10) or (up 212, then left 212), etc
since slope is rise/run , all you need is rise : run = k : -k, , that is, go up and left by the same value.
Graph the line with slope -1 passing through the point (-4,-1).
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