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Posted on April 24, 2022 (Updated on July 28, 2025)

How do you write a translation in math?

Space & Navigation

Math Translations: Sliding Shapes Like a Pro

Ever played with those sliding puzzles where you move the tiles around? Well, in math, a translation is kind of like that! It’s all about moving a shape – or even a whole space – by the same amount in one direction. Think of it as picking up a drawing and just… sliding it across the table. No spinning, no stretching, just a simple shift. It’s a core concept in geometry, popping up everywhere from fancy computer graphics to down-to-earth engineering.

So, what’s the big deal? Well, a translation is a “rigid motion,” which is just a fancy way of saying it keeps everything the same. The angles stay put, and the lengths don’t change. The shape before the move is the “pre-image,” and the new one is the “image.” If you start with shape A, you usually end up with A’ – that’s “A prime,” for short.

Now, how do we actually write these translations down? There are a few cool ways:

  • Coordinate Talk: This is where we use those x and y coordinates you remember from school. A translation becomes something like (x, y) → (x + a, y + b). What that means is, we’re taking every point and shifting it a units horizontally and b units vertically. So, (x, y) → (x + 3, y – 2)? That’s a slide of 3 to the right and 2 down. Easy peasy.

  • Stack ‘Em Up: Column Vectors: I kind of like this one. We use a little stack of numbers, like this:

    (ab)\begin{pmatrix} a \\ b \end{pmatrix}(ab​)

    The top number (a) is still your left-right shift (positive is right, negative is left), and the bottom (b) is your up-down (positive is up, naturally).

  • Vector Power: Think of a vector as an arrow. It’s got a length (how far to move) and a direction (which way to go). That’s your translation in a nutshell!

Okay, so there are a few ground rules to keep in mind when you’re shuffling shapes around:

  • Before & After: Pre-image is the original, image is the translated version. Got it?
  • Same Distance, Same Direction: Every single point on your shape has to move the exact same way. No exceptions.
  • Don’t Get Twist-y: Translations are just slides. No flips, no turns, no resizing.
  • Alright, let’s get practical. How do you actually translate something on a graph?

  • Find Your Vector: Figure out those a and b values from your vector or coordinate rule.
  • Do the Math: Add a to all the x-coordinates, and b to all the y-coordinates.
  • Plot & Connect: Put those new points on the graph, and connect the dots. Boom! Translated.
  • Quick Example:

    Let’s say we’ve got the point (2, 3), and we want to use this translation vector:

    (−14)\begin{pmatrix} -1 \\ 4 \end{pmatrix}(−14​)

    The new point is (2 + (-1), 3 + 4), which simplifies to (1, 7). See? Not so scary.

    You might be thinking, “Okay, cool, but what’s the point?” Well, translations are everywhere!

    • Building Bridges: Engineers use them to shift parts of designs around without messing anything up.
    • Movie Magic: Computer graphics folks use them to move characters and objects on the screen.
    • Robot Dance: Robots use them to move around and grab stuff.
    • Gaming Fun: Ever played a video game? Translations are what make the characters move!

    Now, a few little traps to watch out for:

    • Sign Slip-Ups: That minus sign is sneaky! Negative a means left, negative b means down. Double-check!
    • X-Y Mix-Ups: Don’t get your x and y mixed up. a goes with x, b goes with y. Always.
    • Leaving Points Behind: Make sure you translate every single point on your shape. Don’t leave anyone out!

    Translations might seem simple, but they’re a building block for a lot of cool stuff. Get the hang of them, and you’ll be sliding shapes like a mathematical ninja in no time!

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