anonymous
  • anonymous
Medal and fan! which product represents the solution to the system? 3x+4y=-2 2x+5y=6
Mathematics
  • Stacey Warren - Expert brainly.com
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SOLVED
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schrodinger
  • schrodinger
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anonymous
  • anonymous
apply matrices. \[\left[\begin{matrix}3 & 4 \\ 2 & 5\end{matrix}\right]\left(\begin{matrix}x \\ y\end{matrix}\right)=\left(\begin{matrix}-2 \\ 6\end{matrix}\right)\]
anonymous
  • anonymous
I am sure you can follow the rules of matrices to find the solution of x and y now from the previous post
anonymous
  • anonymous
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anonymous
  • anonymous
my answer^^
anonymous
  • anonymous
try calculating the inverse of the matrix again
anonymous
  • anonymous
anonymous
  • anonymous
\[\left[\begin{matrix}3 & 4 \\ 2 & 5\end{matrix}\right]\left(\begin{matrix}x \\ y\end{matrix}\right)=\left(\begin{matrix}-2 \\ 6\end{matrix}\right)\] \[\left(\begin{matrix}x \\ y\end{matrix}\right)=\left[\begin{matrix}3 & 4 \\ 2 & 5\end{matrix}\right]^{-1}\left(\begin{matrix}-2 \\ 6\end{matrix}\right)\]
anonymous
  • anonymous
remember the inverse of a matrix for a 2x2 matrix \[A=\left[\begin{matrix}a & b \\ c & d\end{matrix}\right]\] then \[A ^{-1}=\frac{ 1 }{ ad-bc }\left[\begin{matrix}d & -b \\ -c & a\end{matrix}\right]\]
anonymous
  • anonymous
feel free to fan me so you can ask me for help straight away when you need it :)

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