An office manager buys 2 office chairs and 4 file cabinets for $380. Next year she buys 4 office chairs and 6 file cabinets for $660. What i

Question

An office manager buys 2 office chairs and 4 file cabinets for $380. Next year she buys 4 office chairs and 6 file cabinets for $660. What is the cost of each office chair, c? What is the cost of each file cabinet, f? Explain how you fond the cost of each chair and file cabinet.

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Hưng Khoa 4 years 2021-08-10T21:25:25+00:00 2 Answers 24 views 0

Answers ( )

  1. phucdien
    0
    2021-08-10T21:26:50+00:00
    Reply

    Answer:

    file cabinet = 50

    chair = 90

    Step-by-step explanation:

    x = chair

    y = file cabinet

    1st year, solve for x

    2x+4y = 380

    2x = 380 – 4y

    x = 190 – 2y

    2nd year

    Now substitute x = 190 – 2y in your 2nd year formula

    4x+6y = 660

    4(190-2y)+6y = 660

    760 – 8y + 6y = 660

    -2y = -100

    y = 50

    The cost of the filling cabinet is 50 each

    Now use the value for y (50) in your first formula to get x

    2x+4y=380

    2x+4*50=380

    2x=380-200

    2x=180

    x=90

  2. lethu
    0
    2021-08-10T21:27:08+00:00
    Reply

    Answer:

    16.5

    Step-by-step explanation:

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