step 1
Find the slope
we take the points
(3,2) and (4,1)
m=(1-2)/(4-3)
m=-1/1
m=-1
step 2
Find the linear equation in slope intercept form
y=m(n)+b
we have
m=-1
point (3,2)
substitute
2=-1(3)+b
b=5
therefore
y=-n+5 or y=5-n
answer is the third option
