Thalia, a quiz show contestant, answered 20 questions. She was awarded 2 points for every correct answer that she gave, but she was penalize

Question

Thalia, a quiz show contestant, answered 20 questions. She was awarded 2 points for every correct answer that she gave, but she was penalized 1 point for every incorrect answer. In the end, Thalia had a total of 28 points. In order to determine the number of correct and incorrect answers that she gave, a viewer at home used the system of linear equations x + y = 20 and 2 x + y = 28, with x being the number of correct answers and y being the number of incorrect answers. The viewer solved the system by using the linear combination method as shown.

x + y = 20. + StartFraction Negative 2 x minus y = negative 28 over Negative x = negative 8 EndFraction. StartFraction negative x Over negative 1 EndFraction = StartFraction negative 8 Over negative 1 EndFraction. X = 8.
8 + y = 20. 8 + y minus 8 = 20 minus 8. y = 12.

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Nick 4 years 2021-08-22T17:02:20+00:00 2 Answers 222 views 0

Answers ( )

  1. King
    0
    2021-08-22T17:03:46+00:00
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    Answer:

    Step-by-step explanation:

  2. vankhanh
    1
    2021-08-22T17:04:15+00:00
    Reply

    Answer:

    Answer: The viewer mistakenly determined that one of the equations in the system should be 2 x + y = 28.

    Step-by-step explanation:

    Step-by-step explanation:

    I did test

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Giải phương trình 1 ẩn: x + 2 - 2(x + 1) = -x . Hỏi x = ? ( )