Plsss help!, bRAInLIST!!

The answer of the above question is

First step is to get rid of the square root. remember that a square root is the same as raising to the (1/2) power. see below: multiply exponents per exponent rules to get: remember you subtract exponents from the denominator and add exponents in the numerator so: simplify further: so a is the correct choice. if you don't understand this google exponent rules and it will you understand. look at the image results.

Line ab is y = -7/5x + 56/5i don't understand  where point d comes into this.