Multiple Choice Question (MCQ)

Which of the ordered pairs is the solution to the equations

\begin{cases} x+2y=5 & \\ x-2y=9 & \end{cases}

  1. ×

    (-7,-1)

  2. ×

    (-1,7)

  3. (7,-1)

  4. ×

    (-7,1)

  5. ×

    (1,7)

Collected in the board: Algebraic equation

Steven Zheng posted 3 months ago


Answer


  1. \begin{cases} x+2y=5 & \\ x-2y=9 & \end{cases}

    2x = 14

    \therefore x = 7

    Plug in the equation, we get

    y = -1




Steven Zheng posted 3 months ago

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