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  1. The first one is perpendicular

    The second one is parallel

    The third one is neither

    Hope this helps 🙂

    Step-by-step explanation:

  2. Equation is 7n-9, a10=61

    Step-by-step explanation:

    nth term of an arithmetic sequence with first term a and common difference d is a+(n-1)d

    Here, a=-2 , d=7

    nth term is -2+(n-1)7=7n-9


  3. (4, -1)

    Step-by-step explanation:

    If you plug in 4 and -1 to both of the functions, they will both "work". They output the correct number and are equal.

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