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Solve two linear equations in two unknowns

This type of question, asked 3 times: 19 Jul 2023 S3, 15 Sep 2025 S2, 20 Sep 2025 S1. All 3 questions below, oldest first.

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  1. Question 1

    19 Jul 2023 S3

    51
    The sum of the two numbers is 98. The difference between the two numbers is 28. Find one of the two numbers.

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  2. Question 2

    15 Sep 2025 S2

    70
    Solve system: y=2x+1y = 2x + 1 and y=−x+4y = -x + 4

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  3. Question 3

    20 Sep 2025 S1

    68
    Find the solution to the system: y=3x−4y = 3x - 4 and y=−x+2y = -x + 2.

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