Part A is 6 and the bottom one is "Take a line and connect it from point C to the middle of A and B then put another line connecting to D to the middle of A and B"
X increases by one
y increases by 2
(5, 1) - > (x + 1, y + 2) -> (6, 3)
The answer to your question is A
The way your problem is set it should be simplified to this....4x + 55