algebra ll

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the first equation of the system is mutiplied by 4, by what number would you mutiply the second equation to eliminate the y variable by adding? first: 2x+5y=16 second:8x - 4y =10 i got 2 0r 5 im not sure which one

  • algebra ll -

    Mulitpy it by 5, so that the coefficent of y in each is 20.

  • algebra ll -

    so the answer is negative 5 right

  • algebra ll -

    No. It is +5, as Bob correcly stated. The coefficient of y in the second equation then becomes -20, so you can eliminate that variable by adding to the first equation.

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