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anonymous

  • one year ago

Solve the system of equations and choose the correct answer from the list of options. 2x + y = −4 y = 3x + 2 negative 6 over five comma negative 8 over 5 negative 8 over 5 comma negative 6 over 5 negative 5 over 6 comma negative 11 over 5 negative 11 over 5 comma negative 6 over 5

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  1. anonymous
    • one year ago
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  2. welshfella
    • one year ago
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    from the first eqaution y = -2x - 4 so you have 2 expressions in x equal to y so equate these 2 and solve for x

  3. triciaal
    • one year ago
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    follow the above

  4. triciaal
    • one year ago
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    |dw:1439053101422:dw|

  5. triciaal
    • one year ago
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    |dw:1439053564241:dw|

  6. anonymous
    • one year ago
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    i dot get it

  7. anonymous
    • one year ago
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    \[\left[\begin{matrix}2 & 1 \\ 3 & -1\end{matrix}\right]\left[\begin{matrix}x \\ y\end{matrix}\right]=\left[\begin{matrix}-4 \\ -2\end{matrix}\right]\] \[A ^{-1}\left[\begin{matrix}\frac{ 1 }{ 5 } & \frac{ 1 }{ 5 } \\ \frac{ 3 }{ 5 } & -\frac{ 2 }{ 5 }\end{matrix}\right]\]\[\left[\begin{matrix}\frac{ 1 }{ 5 } & \frac{ 1 }{ 5 } \\ \frac{ 3 }{ 5 } & -\frac{ 2 }{ 5 }\end{matrix}\right]\left[\begin{matrix}-4 \\ -2\end{matrix}\right]=?\]

  8. anonymous
    • one year ago
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    please help

  9. anonymous
    • one year ago
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    so what does that mean

  10. anonymous
    • one year ago
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    umm you havent learn matrices yet?

  11. anonymous
    • one year ago
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    no

  12. anonymous
    • one year ago
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    then nvm, later you will learn the hax

  13. anonymous
    • one year ago
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    \[2x+y=-4\]\[y=3x+2\]you substitute the second equation of y into the first one

  14. anonymous
    • one year ago
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    so it becomes \[2x+(3x+2)=-4\]

  15. anonymous
    • one year ago
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    much easier to solve?

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