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K.Binks

  • one year ago

Solve 2x – 5y = 1 by the elimination method. 3x – 4y = -2 ?

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  1. DanJS
    • one year ago
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    you want to multiply one of the equations or both by a constant value, so that when you add the equations together, a variable will sum to zero

  2. DanJS
    • one year ago
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    for instance 2x and 3x multiply first equation by 3 will give you 6x multiply second equation by -2 giving -6x added they go to zero and x drops out

  3. jdoe0001
    • one year ago
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    ditto \(\large \begin{array}{llcll} 2x-5y=1&{\color{brown}{ \times 4}}\implies &8x\cancel{-20y}=4\\ 3x-4y=-2&{\color{brown}{ \times -5}}\implies &-15x\cancel{+20y}=10 \\\hline\\ &&\square ?+\square ?=\square ? \end{array}\)

  4. K.Binks
    • one year ago
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    -7x= 14 x=-2?

  5. jdoe0001
    • one year ago
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    yeap

  6. K.Binks
    • one year ago
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    Thank you both!

  7. jdoe0001
    • one year ago
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    yw

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