book Maths Puzzle Numerical Ability

Find an equation of the line through the point (4,5) and perpendicular to the line passing through the points (-1,3) and (2,9).

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book Other Question
2/3 is to 3/4 as X is to 21/24 ?

I had a bunch of other questions similar to this one but they were all decimals. I don't no why but im banging my head over what I know is an ea .....^
..../a
.../....
../......
./........
/b____cd____>

ignore the dots, they are filler to line everything up.
a) 5x-20
b) 2x+8
c) blank
d) 6x+