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11.17: Integer Translations, Paths Between Points

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Have you ever tried to track someone's movements by using a map? Take a look at this situation.

Caro is having a party. She has decided to use a coordinate grid as a map to show a treasure hunt. Caro loves math and thinks that this could be a way to incorporate two of her favorite things together - scavenger hunts and mathematics. She draws a coordinate grid and plots the first two points on the map.

The first point is B and the second point is B' .

Here is what the grid looked like.

Caro wants to draw more points on her map, but first she must record the movement of the path as an integer translation.

Do you know how to do this?

This Concept will teach you how to describe paths of points as integer translations. Then we'll return to this problem at the end of the Concept.

Guidance

A translation is when a figure or a point is moved on a coordinate grid. It is when you slide a figure or a point on a grid. We can use integers to assist us in indentifying different translations.

Here, we started with point A . Then point A was moved on the coordinate grid. It has been translated to a new location. When we slide or translate a point or figure, the new point has a little symbol next to it. Here is how we write a translation.

A to A'

We can use integers to show the path of the translation.

How many units did A move on the x axis?

If you count, you can see that it moved +6 units.

Here, we started with point A . Then point A was moved on the coordinate grid. It has been translated to a new location. When we slide or translate a point or figure, the new point has a little symbol next to it. Here is how we write a translation.

A to A'

We can use integers to show the path of the translation.

How many units did A move on the x axis?

If you count, you can see that it moved +6 units.

How many units did A move on the y axis?

If you count, you can see that it moved -2 units (remember that negative 'y' means down).

We write the translation as (6, -2).

Try one of these on your own. Write the path of B as an integer translation. How many units did A move on the y axis?

If you count, you can see that it moved -2 units (remember that negative 'y' means down).

We write the translation as (6, -2).

Try some of these on your own. Write the path of B as an integer translation.

Example A

If you start at (3,5) and move three units across and four units up, where are you? Write this as an integer translation.

Solution: (6,9)

Example B

True or false. You move horizontally before vertically when figuring out the path of a translation.

Solution: True

Example C

True or false. A translation with a path of (-2,3) means that starting at the original point, you move two places to the left and three places up.

Solution: True

Here is the original problem once again.

Caro is having a party. She has decided to use a coordinate grid as a map to show a treasure hunt. Caro loves math and thinks that this could be a way to incorporate two of her favorite things together - scavenger hunts and mathematics. She draws a coordinate grid and plots the first two points on the map.

The first point is B and the second point is B' .

Here is what the grid looked like.

Caro wants to draw more points on her map, but first she must record the movement of the path as an integer translation.

Do you know how to do this?

To write the movement of point B as an integer translation, we must first write where it started.

The point is plotted at (-2,-1) .

Then we can write the movement of point B to B' as an integer translation.

First, we count the units horizontally from one point to the next.

5

Then we move up vertically three units.

3

The integer translation is (5,3) .

This is our answer.

Vocabulary

Here are the vocabulary words in this Concept.

Quadrants
the four sections of a coordinate grid
Origin
the place where the x and y axis’ meet at (0, 0)
Ordered Pair
the x and y values used to locate points on a coordinate grid (x,y)
x axis
the horizontal axis on the coordinate grid
y axis
the vertical axis on the coordinate grid
Coordinates
the x and y values of an ordered pair
Longitude
vertical measure of degrees on a map
Latitude
horizontal measure of degrees on a map

Guided Practice

Here is one for you to try on your own.

A point is plotted at (-2,1) if the integer translation is (3,-4) , what are the coordinates of the next point?

Answer

To figure this out, we must first plot the first point. Then we move horizontally three units and vertically down four units.

The final point is plotted at (1,-3) .

Video Review

Here is a video for review.

Khan Academy: Quadrants of Coordinate Plane - This video has content which supports student success in this Concept.

Practice

Directions: Use integers to identify each translation.

1. A to A'

2. B to B'

3. C to C'

4. D to D'

5. E to E'

6. F to F'

7. G to G'

8. H to H'

9. H to E

10. E to D

11. E' to G

12. E' to C

13. B to A'

14. B to G'

15. C' to D'

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Difficulty Level:

Basic

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Grades:

Date Created:

Oct 29, 2012

Last Modified:

Aug 05, 2014
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