You need to calculate it's slope.
(x₁,y₁) = (2,10) and (x₂,y₂) = (4,9)
Now,(y₂-y₁) = m(x₂-x₁)
(9-10) = m(4-2)
2m = -1
m = -1/2
Now, take any one point for calculation of b in equation;
10 = -1/2(2) + b
b = 10 + 1
b = 11
So, Equation of the line would be: y = -1/2x + 11
In short, Your Answer would be Option B
Hope this helps!
