Gan tolong kerjain nanti di kumpul
tentukan nilai a+2b untuk a dan b yang memenuhi persamaan matriks berikut.
A.![\left[\begin{array}{ccc}4&6\\5&-3\end{array}\right]](https://tex.z-dn.net/?f=+%5Cleft%5B%5Cbegin%7Barray%7D%7Bccc%7D4%266%5C%5C5%26-3%5Cend%7Barray%7D%5Cright%5D+ "\left[\begin{array}{ccc}4&6\\5&-3\end{array}\right]")
![\left[\begin{array}{ccc}a + 4\\b-7\end{array}\right]](https://tex.z-dn.net/?f=+%5Cleft%5B%5Cbegin%7Barray%7D%7Bccc%7Da+%2B+4%5C%5Cb-7%5Cend%7Barray%7D%5Cright%5D+ "\left[\begin{array}{ccc}a + 4\\b-7\end{array}\right]")
= ![\left[\begin{array}{ccc}-8\\11\end{array}\right]](https://tex.z-dn.net/?f=+%5Cleft%5B%5Cbegin%7Barray%7D%7Bccc%7D-8%5C%5C11%5Cend%7Barray%7D%5Cright%5D+ "\left[\begin{array}{ccc}-8\\11\end{array}\right]")
B.![\left[\begin{array}{ccc}3&2\\5&-4\end{array}\right]](https://tex.z-dn.net/?f=+%5Cleft%5B%5Cbegin%7Barray%7D%7Bccc%7D3%262%5C%5C5%26-4%5Cend%7Barray%7D%5Cright%5D+ "\left[\begin{array}{ccc}3&2\\5&-4\end{array}\right]")
![\left[\begin{array}{ccc}a&1-a\\b&5\end{array}\right]](https://tex.z-dn.net/?f=+%5Cleft%5B%5Cbegin%7Barray%7D%7Bccc%7Da%261-a%5C%5Cb%265%5Cend%7Barray%7D%5Cright%5D+ "\left[\begin{array}{ccc}a&1-a\\b&5\end{array}\right]")
= ![\left[\begin{array}{ccc}5&16\\-21&-10\end{array}\right]](https://tex.z-dn.net/?f=+%5Cleft%5B%5Cbegin%7Barray%7D%7Bccc%7D5%2616%5C%5C-21%26-10%5Cend%7Barray%7D%5Cright%5D+ "\left[\begin{array}{ccc}5&16\\-21&-10\end{array}\right]")
tentukan nilai a+2b untuk a dan b yang memenuhi persamaan matriks berikut.
A.
B.
More Questions From This User See All
4a + 6b = 18 ... (1)
5a + 20 - 3b + 21 = 11
5a - 3b = - 30 ... (2)
eliminasi (1) dan (2) :
4a + 6b = 18
10a - 6b = - 60
_____________ +
14a = - 42
a = - 3
b = 5
B. [3a + 2b 13 - 3a] = [5 16]
[5a - 4b - 5a - 15] [-21 -10]
13 - 3a = 16
- 3a = 3
a = - 1
5(-1) - 4b = - 21
- 4b = -16
b = 4