Geometry. 20 points. check my answer. an explanation would be greatly appreciated.

A is correct. (you chose correctly)

Step-by-step explanation:

Parallel lines always have the same slope, so we know it's either a or b because the both have the slope of 1/4. When you plug -1, 5 into the equation you chose, you get 0=0, so that is the correct one.

∠acb = 8°

step-by-step explanation:

∠xba lies on the circle and is half the measure of the intercepted arc ax

hence

measure of arc ax = 2 × 42° = 84°

∠acb is outside the circle and is

∠acb = (arcab - arcax ), hence

∠acb = 0.5 (100 - 84) = 0.5 × 16° = 8°