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Elementary Geometry for College St...

6th Edition
Daniel C. Alexander + 1 other
ISBN: 9781285195698

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BuyFindarrow_forward

Elementary Geometry for College St...

6th Edition
Daniel C. Alexander + 1 other
ISBN: 9781285195698
Textbook Problem
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Are these points collinear?

a) A - 2 ,   5 , B 0 ,   2 , and C 4 ,   - 4

b) D - 1 ,   - 1 , E 2 ,   - 2 , and F 5 ,   - 5

To determine

(a)

To check:

Whether the points A-2, 5, B0, 2, and C4, -4 are collinear.

Explanation

If the points are collinear, then the slope of the lines making with the points are same.

The slope of the line that contains the points x1,y1 and x2,y2 is given by

m=y2-y1x2-x1 for x2x1

Let mAB- and mBC- are the slopes of the line AB- and BC- respectively.

The given points are A-2, 5 and B0, 2.

Using the slope formula and choosing x1=-2, x2=0, y1=5, and y2=2

To determine

(b)

To check:

Whether the points D-1, -1, E2, -2, and F5, -5 are collinear.

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