Answer:
y=-1*x+2
Step-by-step explanation:
We start with the equation of the line y=m*x+b and are given m=-1
Also we are given that the point (1,1) satisfies the equation, this mieans that we replace (x,y) for (1,1)
1=-1*1+b this gives us an equation that can be solved for b
b=1+1
So the general formula for generic x,y is y=-1*x+2