Answer:
y= -x+4
Explanation:
Given the point (3,1) and the slope of -1, you could start by using point slope formula. Point slope formula is: (y-y1)=m(x-x1).
Now, plug this in.
(y-1)=-1(x-3), and expand: y-1= -x+3
So, y= -x+4 would be the equation of the line in standard form. (y=mx+b)