Plis bantu saya untuk menjawabnya..

Plis bantu saya untuk menjawabnya..

Jawaban Terkonfirmasi

Jawab
12
cara invers :

$left[begin{array}{ccc}x\yend{array}right],=, frac{1}{18+20} left[begin{array}{ccc}-6&4\-5&3end{array}right] left[begin{array}{ccc}2\4end{array}right],=, left[begin{array}{ccc}2\1end{array}right]$

cara determinan

$det,D,= left|begin{array}{ccc}3&-4\5&-6end{array}right] ,=,3(-6)-5(-4)=2$

$det,X,= left|begin{array}{ccc}2&-4\4&-6end{array}right] ,=,2(-6)-4(-4)=4$

$det,Y,= left|begin{array}{ccc}3&2\5&4end{array}right] ,=,3(4)- 5(2)= 2$

x = Dx/D = 4/2 = 2
y = Dy/D = 2/2 = 1

11.
det A = 3 (2) 2(-4) = 14
det B = -1(2) -4(5) = -22
det A. det B = 14 (-22) = – 308

$A,B,= left[begin{array}{ccc}-9&7\6&14end{array}right],; det,A,.B,=-9(14)-6(7) = - 308$

det A. det B = det(A.B)

10)
x + y = 4x – 5y
-3x = – 6y
x = 2y

2x – 15 = 6x + 7y
-4x – 7y = 15
-4(2y) – 7y = 15
-15y = 15
y = -1
x= 2y
x = -2
(x,y)= (- 2, – 1)

$left[begin{array}{ccc}8&3&5end{array}right] left[begin{array}{ccc}200\2000\1500end{array}right] ,=, left[8(200)+3(2000)+5(1500}right],=15.100$

1)
a) x ≥ 20
b) 0 ≤ x ≤ 32
c) 5 ≤ x ≤ 10

3)
-3x + 2y ≥ 6
x = 0 , y = 3
y = 0 , x = -2
DHP (gambar no .3)

4)
3x – 5y ≤ 15
x = 0, y = – 3
y = 0, x = 5
5 < y < 10
5 < x< 10
DHP (gambar no. 4)

Gambar Jawaban