? 發問於 科學及數學數學 · 1 十年 前

maths questions:

In a bookstore,the prices of a ball-pen and a atapler are$a and$b respectively.Itis given that three ball-pens are chapter than two stapler by $4.

Express y in term of x

3x+4/2

if two dozen ball-pens cost $48 more than half dozen staplers,find x.

how to calculate??

1 個解答

評分
  • 1 十年 前
    最佳解答

    although I don't why there is no "x" &"y" in the question, I let $a=x, $b=y.

    2y-3x=4

    2y=3x+4

    y=(3x+4)/2--------a

    24x-6y=48

    4x-y=8

    y=4x-8-----------b

    a=b

    (3x+4)/2=4x-8

    3x+4=8x-16

    5x=20

    x=4

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