Question 873332
you have three points
(2,1)
(4,0)
(6,-1)
you have already mentioned the rise -1 (change in y) and the run +2 (change in x)
rise over run = slope
so the slope is -1/2
y=-1/2x+b
0=-1/2*4+b
0=-2+b
b=2
y=-1/2x+2