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    Need to know a few things for an upcoming exam that I have no clue to do:

    1) Figure out the equation of a perpendicular line when given just the coordinates

    2) Use a sketch of a quadratic to find coordinate k

    3) Use vectors to write a proof

    If anyone could help with these or link videos explaining them then I'd be very grateful.

    Thanks.
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    1) find the gradient of the line between the two points by doing (y2 - y1) / (x2 - x1). find the negative reciprocal of this (in other words do 1 over the gradient and change the sign). That's the gradient of the perpendicular line. After that I think you'd need to find the midpoint of the original line ((x1 + x2) / 2), ((y1 + y2) / 2) and then use y - y1 = m(x - x1) to find the equation of the perpendicular line.

    Not entirely sure what you mean by the other two questions, sorry
 
 
 
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