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# C1 Exersise 5F Help watch

1. I need help with every single question listed on this image http://postimg.org/image/6zm9cufjx/25a3974c/
2. y-y'=m(x-x') where m is the gradient, x' and y' are co-ordinates.
(y'-y'')/(x'-x'') where x' and x'' are the x co-ordinates of two points of a line, used to find m

For q12, (5+2)/(-1-4) = 7/-5 or -7/5
then use either point, y-5=-7/5(x+1) to give in form of ax + by + c = 0
Looks like most questions just follow this in one way or another, like rearranging to find k etc

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