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# Vectors Help watch

1. Vtuhvth
2. (Original post by Deeboss)
Suppose a 2D line passes through two points P0(10, 15) and P1(200, 20). Answer Questions 7 * 10 regarding this line

Question 8) Which of the following equations represent the line?

5x - 190y +2800=0

5x + 6y -8=0

(x-10, y-15)•(-5, 190)=0

(x-200, y-20)•(5, -190)=0

I worked this out using m=y2-y2/x2-x1

y=1over38x+14 14over19

This seems wrong, because it does not match with the answers given in the question? This is in relation to the points P0 (10,15), and P1(200,20)
So you have . This means that but .

So your equation is as you've said.

But if you multiply both sides by and subtract from both sides, what are you left with?
3. (Original post by Zacken)
So you have . This means that but .

So your equation is as you've said.

But if you multiply both sides by and subtract from both sides, what are you left with?
5x - 190y +2800=0 is the final answer?
4. (Original post by Deeboss)
5x - 190y +2800=0 is the final answer?
Yep.
5. (Original post by Zacken)
Yep.
One more question!

Suppose a 2D line passes through two points P0(10, 15) and P1(200, 20). Answer Questions 7 * 10 regarding this line.

Question 8)

Which of the following vectors perpendicular to the line?

(5, 190)

(-2.5, 95.0)

(-5, -190)

(5, -190)

From what I have done it is either (5,-190), or (-5,-190)?
Could you give me your thoughts?

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