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  • 2009 December(68A) Math Question 6

    Algebraic & Function Expressions

    - Systems of Equations

    Choice J
    $$3\ pieces=x,\ y,\ z$$ $$x=2y=2(2z)=4z$$ $$y=2z$$ $$\Rightarrow x+y+z=4z+2z+z=21$$ $$\Rightarrow 7z=21$$ $$\Rightarrow z=3$$ $$x=4z=12$$

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