K is the constant of proportionality also the same as slope. You can see the commonality in the equations y = kx y = mx + b The difference is that is a direct proportion the line will always go through the origin so the b will be zero. The answer is B.
B) 40 because if you add the two angles at the bottom which are shown to be congruent, then subtract 180 from the sum of those two, then you are left with your answer
