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96smidge

Given the system of equations, what is the value of the system determinant? x + y = 8 x - y = 10

  • one year ago
  • one year ago

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  1. fewscrewsmissing
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    To find the determinant of a 2x2 matrix: \[A = \left[\begin{matrix}a & b \\ c & d\end{matrix}\right]\\ |A|=det(A)=ad-cb\]

    • one year ago
  2. fewscrewsmissing
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    I'd actually forgotten how to do this since it's been so long, and it literally took a 2 second Google search ;)

    • one year ago
  3. jedai17
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    a and c is the value of x and b and d is the value of y

    • one year ago
  4. jedai17
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    |dw:1361514044728:dw|

    • one year ago
  5. jedai17
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    then find the determinant according to the formula given by @fewscrewsmissing

    • one year ago
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