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Math Help - Help With Linear Equations !!!!

  1. #1
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    Help With Linear Equations !!!!

    Hi,

    Ive got 3 questions about equations that are below, Im not very good with equations but im hoping one of you guys can show me how to work it out.

    1. F = MV - MU divided by T / Find F when M = 2, U =4, V = 7, T =3

    Given that y = x2 + 3x - 5, find y when x = 4

    2. Bag of Kitty Litter : 2.20 per bag + 3 postage

    Let N be the number of kitty bags that Jenny buys.
    Write down an equation to represent the amount, =A, that jenny will pay for N bags of cat litter by mail order

    3. The area of a rectangle has the same numerical value as the perimeter of the square, By forming an equation in X, find the length of the rectangle.

    ..................
    6cm
    (x + 4) cm

    2. ...............
    18cm

    I really hope one of you guys can help as im stumped.

    Thanks
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  2. #2
    MHF Contributor

    Joined
    Apr 2005
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    1472

    Re: Help With Linear Equations !!!!

    Quote Originally Posted by joshuafalls View Post
    Hi,

    Ive got 3 questions about equations that are below, Im not very good with equations but im hoping one of you guys can show me how to work it out.

    1. F = MV - MU divided by T / Find F when M = 2, U =4, V = 7, T =3
    Is this F= \frac{MV- MU}{T}? Then F= \frac{(2)(7)- (2)(4)}{3}. That's just arithmetic.

    Given that y = x2 + 3x - 5, find y when x = 4
    Is this y= x^2+ 3x- 5? (Use "^" to indicate powers.) Then y (4)^2+ 3(4)- 5.

    2. Bag of Kitty Litter : 2.20 per bag + 3 postage

    Let N be the number of kitty bags that Jenny buys.
    Write down an equation to represent the amount, =A, that jenny will pay for N bags of cat litter by mail order
    Multiply N times 2.20 and add 3.

    3. The area of a rectangle has the same numerical value as the perimeter of the square, By forming an equation in X, find the length of the rectangle.

    ..................
    6cm
    (x + 4) cm

    2. ...............
    18cm

    I really hope one of you guys can help as im stumped.
    I can't understand your picture. But the perimeter is the sum of the lengths of all sides and area is "width times height". Set those equal.

    Thanks[/QUOTE]
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