Chapter 12.4, Problem 10E

To determine

To draw: The polygon with the given vertices. Also, predict where in the coordinate plane its image will lie after the specified translation. Then find the coordinates of the vertices and draw the image.

Answer to Problem 10E

The polygon $JKLMN$ and image $J\text{'}K\text{'}L\text{'}M\text{'}N\text{'}$ can be represented on a graph as:

Explanation of Solution

Given information:

The coordinates of polygon $JKLMN$ :

$J(-3,2),K(-2,1),L(1,1),M(1,-2),N(0,-4)$

The following coordinate notation:

$(x,y)\to (x-3,y)$

The polygon can be drawn as follows:

To predict where in the coordinate plane the image will lie after translation, look at the coordinate notation for the translation. $3$ is subtracted from each $x$ coordinate, so the figure shifts to the left. Also, no changes are made in the $y$ coordinate, so the figure neither shifts up nor down. Therefore, the image of polygon $JKLMN$ will be to the exact left of polygon $JKLMN$ .

To translate $JKLMN$ , subtract $3$ from the $x$ coordinate and make no changes in the $y$ coordinate of each vertex

$\begin{array}{l}\text{Original Image}\\ (x,y)\to (x-3,y)\\ J(-3,2)\to J\text{'}(-6,2)\\ K(-2,1)\to K\text{'}(-5,1)\\ L(1,1)\to L\text{'}(-2,1)\\ M\text{(1,}-2\text{)}\to M\text{'}\text{(}-2\text{,}-2\text{)}\\ N(0,-4)\to N\text{'}(-3,-4)\end{array}$

The image $J\text{'}K\text{'}L\text{'}M\text{'}N\text{'}$ using the above coordinates will be as follows:

Observation: The image has moved $3$ units to the left.