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Answer:
m=1/0 (undefined)
equation=y2-y1/x2-x1=y-y1/x-x1
since M is undefined and M=y2-y1/x2-x1
then the equation=y-y1/x-x1=1/0
y-3/x--1=1/0
cross multiplying
0 (y-3)=1 (x+1)
=x+1