Diketahui matriks P=![\left[\begin{array}{ccc}2&-1\\5&12\\\end{array}\right]](https://tex.z-dn.net/?f=+%5Cleft%5B%5Cbegin%7Barray%7D%7Bccc%7D2%26-1%5C%5C5%2612%5C%5C%5Cend%7Barray%7D%5Cright%5D+ "\left[\begin{array}{ccc}2&-1\\5&12\\\end{array}\right]")
, Q=![\left[\begin{array}{ccc}2x&2\\7&5y\\\end{array}\right]](https://tex.z-dn.net/?f=+%5Cleft%5B%5Cbegin%7Barray%7D%7Bccc%7D2x%262%5C%5C7%265y%5C%5C%5Cend%7Barray%7D%5Cright%5D+ "\left[\begin{array}{ccc}2x&2\\7&5y\\\end{array}\right]")
, dan R=![\left[\begin{array}{ccc}10&z\\-\frac{9}{4} &7\\\end{array}\right]](https://tex.z-dn.net/?f=+%5Cleft%5B%5Cbegin%7Barray%7D%7Bccc%7D10%26z%5C%5C-%5Cfrac%7B9%7D%7B4%7D+%267%5C%5C%5Cend%7Barray%7D%5Cright%5D+ "\left[\begin{array}{ccc}10&z\\-\frac{9}{4} &7\\\end{array}\right]")
. Jika P-2Q=3R, maka tentukan nilai x, y, z. Mohon bantuannya ya ..
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2 - 2(2x) = 3(10)
2 - 4x = 30
- 4x = 30 - 2
- 4x = 28
x = 28/(-4)
x = -7
12 - 2(5y) = 3(7)
12 - 10y = 21
- 10y = 9
y = -9/10
-1 - 2(2) = 3(z)
-1 - 4 =3z
-5 = 3z
z = -5/3
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