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# Urgent Maths Help watch

1. 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.
2. 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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Updated: February 1, 2017
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