Question

please helpp...
question in comments

Answer 1

@phi

Answer 2

An equation for a line using vectors uses this idea:

we have a "direction vector" that we can "travel along" in the direction of the line.
To find this direction vector, define B-A (this will give you a vector that points in the correct direction)
then add a "starting point" A
P= A + t(B-A)
where t is a scalar that lets us move along the line.

Use the definitions of vector A and B in that expression.

Answer 3

its okay for part (i)
what for second part ?

Answer 4

the vector P (tail at the origin, head at point P)
is perpendicular to the "direction vector" B-A

Answer 5

can you figure it out or do you want more info?