minta tolong no.1 pake caranya + ga boleh ngasal!noted : ini soal bab matrik kelas 11 SMA, bukan per.... Question from @yxts

Matriks invers

3 baju dan 2 celana = 310.000
2 baju dan 4 celana = 420.000
misalkan x = baju dan y = celana
maka matriks koefisiennya

$\left[\begin{array}{ccc}3&2\\2&4\end{array}\right] \left[\begin{array}{ccc}x\\y\end{array}\right] = \left[\begin{array}{ccc}310.000\\420.000\end{array}\right]$

$\left[\begin{array}{ccc}x\\y\end{array}\right] = \left[\begin{array}{ccc}3&2\\2&4\end{array}\right]^{-1} \left[\begin{array}{ccc}310.000\\420.000\end{array}\right]$

$\left[\begin{array}{ccc}x\\y\end{array}\right] = \frac{1}{3(4) -2(2)} \left[\begin{array}{ccc}4&-2\\-2&3\end{array}\right] \left[\begin{array}{ccc}310.000\\420.000\end{array}\right]$

$\left[\begin{array}{ccc}x\\y\end{array}\right] = \frac{1}{8} \left[\begin{array}{ccc}4(310.000)-2(420.000)\\-2(310.000)+ 3(420.000)\end{array}\right]$

$\left[\begin{array}{ccc}x\\y\end{array}\right] = \frac{1}{8} \left[\begin{array}{ccc}400.000\\640.000)\end{array}\right]$

$\left[\begin{array}{ccc}x\\y\end{array}\right] =\left[\begin{array}{ccc}50.000\\80.000)\end{array}\right]$

harga 1 baju = x = Rp. 50.000
harga 2 celana = y = Rp. 80.000

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