MYP 1 Mathematics · Algebra

Coordinate geometry — plotting points and travel graphs

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  1. Question 1

    What are the coordinates of the origin on a number plane?
    No clue? Show me the answer
    Correct answerCorrect!Incorrect
    A(0, 0)

    Step-by-step walkthrough

    Choose a solution method

    Method #1Direct Approach

    Step 1: Identify what the origin is

    The origin is the special point where the x-axis and the y-axis cross each other. It is labelled O on the number plane.

    Step 2: Apply the definition of coordinates

    At the origin, there is no movement along the x-axis and no movement along the y-axis. This means both the x-coordinate and y-coordinate are zero.

    Step 3: Write the coordinates

    Since and , the coordinates of the origin are written as (0, 0).

    Method #2Process of Elimination

    Step 1: Identify what is being asked

    We need to find the coordinates of the origin — the point where both axes meet.

    Step 2: Eliminate (1, 1)

    The point (1, 1) is 1 unit to the right and 1 unit up from the origin — it is not the origin itself.

    Step 3: Eliminate (0, 1) and (1, 0)

    The point (0, 1) lies on the y-axis but 1 unit above the origin, and (1, 0) lies on the x-axis but 1 unit to the right. Neither is the crossing point of both axes.

    Step 4: Select the correct answer

    The origin is where both axes cross, so both coordinates must be zero. The correct answer is (0, 0).

  2. Question 2

    A point is plotted by starting at the origin, moving 5 units to the right, and then 3 units downward. What are the coordinates of this point?
    No clue? Show me the answer
    Correct answerCorrect!Incorrect
    A(5, −3)

    Step-by-step walkthrough

    Choose a solution method

    Method #1Direct Approach

    Step 1: Identify the direction rules

    Moving right from the origin gives a positive x-coordinate. Moving downward from the x-axis gives a negative y-coordinate.

    Step 2: Apply the directions to find each coordinate

    Moving 5 units to the right means . Moving 3 units downward means .

    Step 3: Write the ordered pair

    Coordinates are always written as , so the point is (5, −3). Remember: x-coordinate first, then y-coordinate.

    Method #2Process of Elimination

    Step 1: Identify what each movement means

    We need a point that is 5 to the right (positive x) and 3 downward (negative y). The correct form is .

    Step 2: Eliminate (−5, 3)

    The point (−5, 3) is 5 units to the left and 3 units up — the opposite of what was described.

    Step 3: Eliminate (3, −5)

    The point (3, −5) has the numbers swapped — it moves 3 right and 5 down, not 5 right and 3 down.

    Step 4: Eliminate (5, 3)

    The point (5, 3) is 5 right and 3 up, but the description says downward, so the y-coordinate must be negative.

    Step 5: Select the correct answer

    The only option matching 5 right and 3 down is (5, −3).

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