Lesson 12
Using Equations for Lines
Problem 1
Select all the points that are on the line through \((0,5)\) and \((2,8)\).
\((4,11)\)
\((5,10)\)
\((6,14)\)
\((30,50)\)
\((40,60)\)
Solution
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Problem 2
All three points displayed are on the line. Find an equation relating \(x\) and \(y\).
![Coordinate plane, first quadrant. Line is drawn through 3 comma 3, x comma y, and 6 comma 9](https://cms-im.s3.amazonaws.com/DMg9XQDzFhyTsDv96CYqYFwL?response-content-disposition=inline%3B%20filename%3D%228-8.2.C.PP.Image.07.png%22%3B%20filename%2A%3DUTF-8%27%278-8.2.C.PP.Image.07.png&response-content-type=image%2Fpng&X-Amz-Algorithm=AWS4-HMAC-SHA256&X-Amz-Credential=AKIAXQCCIHWF3XOEFOW4%2F20240630%2Fus-east-1%2Fs3%2Faws4_request&X-Amz-Date=20240630T172021Z&X-Amz-Expires=604800&X-Amz-SignedHeaders=host&X-Amz-Signature=47ce34ad785aef6d2c0de7b1fae23d3a97d5343ac2f49dafce899f95bd2b3d47)
Solution
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Problem 3
Here is triangle \(ABC\).
![Triangle on graph. A at 2 comma 0, B at 5 comma 0, C at 5 comma 1.](https://cms-im.s3.amazonaws.com/kWE9CbmscGYiHpfH7VEWeV1G?response-content-disposition=inline%3B%20filename%3D%228-8.2.C12.newPP.Image.01.png%22%3B%20filename%2A%3DUTF-8%27%278-8.2.C12.newPP.Image.01.png&response-content-type=image%2Fpng&X-Amz-Algorithm=AWS4-HMAC-SHA256&X-Amz-Credential=AKIAXQCCIHWF3XOEFOW4%2F20240630%2Fus-east-1%2Fs3%2Faws4_request&X-Amz-Date=20240630T172021Z&X-Amz-Expires=604800&X-Amz-SignedHeaders=host&X-Amz-Signature=a420f3ce925f50dce707d9062684ef8c27d2b4bd5447cf4ba6ec051cf8e19b66)
- Draw the dilation of triangle \(ABC\) with center \((2,0)\) and scale factor 2.
- Draw the dilation of triangle \(ABC\) with center \((2,0)\) and scale factor 3.
- Draw the dilation of triangle \(ABC\) with center \((2,0)\) and scale factor \(\frac 1 2\).
- What are the coordinates of the image of point \(C\) when triangle \(ABC\) is dilated with center \((2,0)\) and scale factor \(s\)?
- Write an equation for the line containing all possible images of point \(C\).
Solution
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Problem 4
Here are some line segments.
![Point A, segment B C and 3 other segments, E D, G J and F H.](https://cms-im.s3.amazonaws.com/zdMfaMmDpto438hxcaUeKFDV?response-content-disposition=inline%3B%20filename%3D%228-8.2.A.PP.Image.16.png%22%3B%20filename%2A%3DUTF-8%27%278-8.2.A.PP.Image.16.png&response-content-type=image%2Fpng&X-Amz-Algorithm=AWS4-HMAC-SHA256&X-Amz-Credential=AKIAXQCCIHWF3XOEFOW4%2F20240630%2Fus-east-1%2Fs3%2Faws4_request&X-Amz-Date=20240630T172021Z&X-Amz-Expires=604800&X-Amz-SignedHeaders=host&X-Amz-Signature=cd2c40bbfe982c864e49fbc39fbbca232b2a7c4cf510e956e31c675cbb51cdb9)
- Which segment is a dilation of \(\overline{BC}\) using \(A\) as the center of dilation and a scale factor of \(\frac23\)?
- Which segment is a dilation of \(\overline{BC}\) using \(A\) as the center of dilation and a scale factor of \(\frac32\)?
- Which segment is not a dilation of \(\overline{BC}\), and how do you know?
Solution
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(From Unit 2, Lesson 4.)