Jawab:
Jawab:
[tex]PQ=\left[\begin{array}{ccc}1&x\\2&4\end{array}\right] \left[\begin{array}{ccc}y&3\\-1&-x\end{array}\right][/tex]
[tex]=\left[\begin{array}{ccc}1(y)+x(-1)&1(3)+x(-x)\\2(y)+4(-1)&2(3)+4(-x)\end{array}\right][/tex]
[tex]=\left[\begin{array}{ccc}y-x&3-x^{2} \\2y-4&6-4x\end{array}\right][/tex]
[tex]3PQ=3\left[\begin{array}{ccc}y-x&3-x^{2} \\2y-4&6-4x\end{array}\right][/tex]
[tex]=\left[\begin{array}{ccc}3y-3x&9-3x^{2} \\6y-12&18-12x\end{array}\right][/tex]
[tex]3PQ = R[/tex]
[tex]\left[\begin{array}{ccc}3y-3x&9-3x^{2} \\6y-12&18-12x\end{array}\right]=\left[\begin{array}{ccc}0&6 \\-6&6\end{array}\right][/tex]
3y-3x = 0 ⇒ persamaan 1
9-3x² = 6 ⇒ persamaan 2
6y-12 = -6 ⇒ persamaan 3
18-12x = 6 ⇒ persamaan 4
persamaan 3:
6y - 12 = -6
y = 1
persamaan 4:
18-12x = 6
x = 1
y - x = 1 - 1
= 0
[answer.2.content]
