Given data:
The given slope of the line is m=-1/2
The given point is (a,b)=(4,0).
The expression for the equation of the line is,
y-b=m(x-a)
Substitute the given values in the above expression.
y-0=(-1/2)(x-4)
y=(-1/2)x+2
Thus, the first option is correct.
