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Answer:
y=-x+4
Step-by-step explanation:
m=(y2-y1)/(x2-x1)
m=(2-3)/(2-1)
m=-1/1
m=-1
y-y1=m(x-x1)
y-3=-1(x-1)
y-3=-x+1
y=-x+1+3
y=-x+4