Trace Screen Coordinates

Supplied materials

• Paper and pencil; answers may also be spoken or typed.
• All cases, labels, numbers and rules are supplied on this page. No real account, private information or purchase is needed.

Learn the idea

A screen model can use coordinates to locate an object. In our model x increases right and y increases down, so it differs from some graph conventions. Movements change one coordinate at a time. Record the coordinate rule before tracing a picture so the direction does not depend on guesswork.

Apply the stated coordinate direction and report the final ordered pair. Do not use an upward-positive y convention when the screen model says down is positive.

Use this supplied case: Screen rule: right adds x; down adds y. Start(1,1), move right 2 and down 3. Final position? Use the details in this example. Say which detail helped you choose. This pretend example does not tell us how every real system works.

1. Follow the worked example one step at a time. Say or draw what happens.
2. Apply the stated coordinate direction and report the final ordered pair.
3. Say which detail makes the example answer fit. Pick another answer and say why it does not fit.
4. Try the question and practice questions. Read the rule again if your answer does not match the explanation.

Check your reasoning

Your answer is temporary and is not saved to an account. Download your current answer before leaving or reloading. Written work on paper or in another app stays in your own file.

Take it further

Screen rule: x right, y down. Start(2, 2), move left 1 and up 1. Expected:(1, 1); explicitly apply the stated coordinate convention.

Nothing here is saved to an account or sent to a teacher. The answer download includes your current choice and any checked feedback. It does not include choices from the separate More practice section. Download that section separately.