Algebra 2

Use Cramer's rule to find the number of items the company must sell each week to break even.

y= 20x + 200
y= 25x
D= |20 -1|. -20 - (-25)
. |25 -1| D= 5

Dx= |200 -1|. -200 - 0
. |0 -1| Dx= -200

Dy= |20 200|. 0 - 5000
. |25 0 | Dy= -5000

x= Dx/D x= -200/5 x= -40
y= Dy/D y= -5000/5 y= -1000

Is This Right?

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  1. 20 x - 1 y = -200
    25 x - 1 y = 0

    D = -20 + 25 = 5

    Dx =
    | -200 -1 |
    | +000 -1 | / 5

    = 200/5 = 40 sign ?

    Dy =
    | 20 -200 |
    | 25 +000 | /5

    = 5000/5 = 1000

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    posted by Damon

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