Which equation is the result of adding theses two equations -2x+4y=17 3x-10y=-3

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Which equation is the result of adding theses two equations -2x+4y=17 3x-10y=-3

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Thu Thủy 2 months 2021-07-29T09:22:40+00:00 1 Answers 2 views 0

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    2021-07-29T09:24:10+00:00

    Answer:

    x=-79/4, y=-45/8. (-79/4, -45/8).

    Step-by-step explanation:

    -2x+4y=17

    3x-10y=-3

    —————

    3(-2x+4y)=3(17)

    2(3x-10y)=2(-3)

    ———————-

    -6x+12y=51

    6x-20y=-6

    ——————

    -8y=45

    y=45/-8=-45/8

    3x-10(-45/8)=-3

    3x+450/8=-3

    3x+225/4=-3

    3x=-3-225/4

    3x=-12/4-225/4

    3x=-237/4

    x=(-237/4)/3

    x=(-237/4)(1/3)

    x=-237/12=-79/4

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