Minta tolong kasih tau cara no 11 12 13 makasih :v

--Matriks

11.
b = baris
k = kolom
operasional  b2k2 --> 2d + 3 = 3d --> d = 3
operasional  b2k1 --> -1 + c + d = 3c
-1 + c + 3 = 3c
2 + c = 3c
c = 1

12.
operasional b1k1 --> 2x -y = - 7......(kalikan 6)
operasionalb2k2 --> 5x -6y = -21...(kalikan 1)
12x - 6y = - 42
5x - 6y  = - 21
kurangkan
7x  = - 21
x = - 3
dan 2x - y = - 7
-6 -y = -7
y = 1
operasional b3k3 --> -2x + 5y = 2z - 1
2(-3) + 5(1) = 2z - 1
-6 + 5 = 2z -1
-1 = 2z -1
z = 0

13.
misalkan ²log x = a dn ²log y = b
2a + 4b = 5
4a + 3b = 5
eliminasi
4a + 8b = 10
4a + 3b = 5
5b = 5
b = 1  --> ²log y = b -->y = 2ᵇ = 2
2a + 4b = 5
2a + 4(1) = 5
2a = 1
a = 1/2 --> ²log x = 1/2 --> x = 2¹/² --> x = √2
hasil x y = √2 (2) = 2√2