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## Basic geometry and measurement

### Course: Basic geometry and measurement>Unit 14

Lesson 2: Translations

# Determining translations

We can find the translation by figuring out how much the x- and y-coordinates need to change to map one triangle onto the other. We map each point to its corresponding point in the other triangle. Moving left means the translation of x is negative, and moving down means the translation of y is negative..

## Want to join the conversation?

• I can't translate Point B'(6,-5) B(-5,-2)
It doesn't make any sense?
• I am not positive about what you are asking, but I will do my best:

B is a point on a graph. It is 5 points to the left of the Y-axis (-5). B is also 2 points below the X-axis (-2). B's coordinates are x:-5 y:-2 or (-5,-2).

B' is a movement of B on the graph. That little apostrophe is how you know it is not the original. B' is 6 points to the right of the Y-axis and 5 points below the X-axis. So B''s coordinates are x:6 and y:-5 or (6,-5).

The difference between these points can be found with subtraction:

X: 6-(-5)=11
B's X coordinate moved 11 units to get to B'.

Y:-5-(-2)=-3
B's Y coordinate moved -3 units to get to B'.

B' is a translation of B by (11,-3)

I hope this helped (:
• If someone says to you "Point Q'(3,2) is the image of Q(6,4) under a translation. Determine the translation." Then what do you do? I think the translation is 3 units to the right and two units up, but Khan Academy says that it is wrong.
• whats B' (-3,-4) is the image of B after a reflection in the y-axis, What are the coordinates of B?
translations
• Where are you reflecting?
Like where is the mirror line going and its slope?
• i dont really understand the problem without the graph
• the blue triangle is the preimage and the grey triangle is the triangle that we want the image to match to.
• hey guys if you have a problem this can help
Point A′(2,3) is the image of A(3,−4) under a translation.
Determine the translation.
Use non-negative numbers.
• In that case, you will say translate 1 unit to the left and 7 units up instead of (-1,7). Please let me know if that doesn't answer your question.
• Is this program ran in Asia?
• Yes, I think Khan Academy is available anywhere. It should be available in Asia.
• for this video he showed an easier example than the problems I am actually doing
• rn crying fr