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The Formula for that

m= -1; (3,1)

Let the coordinate 3 be the y and coordinate 1 be the x
y-3= -1(x-1)

y-3+3= -x+1+3

Cancel the -3 and +3

So, y= -x+1+3

  Answer is y= -x+4

Hoped I help you ;D
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