nilai y = ...

Jika $\left[\begin{array}{cc}3& 4y\\ -6& 15\end{array}\right]=3\left[\begin{array}{cc}1& -8\\ -2& 5\end{array}\right]$, nilai y =...

A. $-6$

B. $-1$

C. $2$

D. $4$

E. $8$

Penyelesaian

$\left[\begin{array}{cc}3& 4y\\ -6& 15\end{array}\right]=3\left[\begin{array}{cc}1& -8\\ -2& 5\end{array}\right]$

$\left[\begin{array}{cc}3& 4y\\ -6& 15\end{array}\right]=\left[\begin{array}{cc}3& -24\\ -6& 15\end{array}\right]$

$4y=-24$

$y=\frac{-24}{4}=-6$

Kesimpulan

Jadi, nilai y nya adalah -6

Jawaban : A

Muda Berkarya Intelektual Normatif

Muda Berkarya Intelektual Normatif