Vectors 3Q Watch

Deeboss
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Gregorius
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(Original post by Deeboss)
Suppose a 2D line passes through two points P0(10, 15) and P1(200, 20).

Which of the following vectors perpendicular to the line?

(5, 190)

(-2.5, 95.0)

(-5, -190)

(5, -190)

I think that the answer may be (5,190)? Seeing that it would be (190,5) if the line was parallel? I worked out the parallel line by doing 200-20, and 20-15. I am not so sure about how to work it out if its perpendicular.
Do you know how to take the dot product of two vectors? If not, sketch them on a plot.
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Deeboss
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(Original post by Gregorius)
Do you know how to take the dot product of two vectors? If not, sketch them on a plot.
The dot product of both vectors would be 2300 right? How does relate to the answers given in the question?
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Gregorius
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(Original post by Deeboss)
The dot product of both vectors would be 2300 right? How does relate to the answers given in the question?
The vector from P0 to P1 is (190,5). Take the dot product of this with each of your vectors in turn...
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