1.tentukan himpunan penyelesaian dari sistem persamaan linear berikut ini dengan metode subsitusi. a. 3x - 2y = 6 6x + y = 4 b. x + y = 1 x - y = 1 c. x + y = 5 2x + 3y = 12
TOLONG DIBANTU YANG BISA
dindakmdt
1. Hp {14/27, 1} 2. Hp {0, 1} 3. Hp {3, 2}
2. Hp {0, 1}
3. Hp {3, 2}
6x+y = 4 --> y = 4-6x
substitusi
3x-2y = 6
3x-2(4-6x) = 6
3x-8+12x = 6
15x = 6+8
15x = 14
x = 14/15
y = 4-6(14/15)
y = 4-28/5
y = 20/5 - 28/5
y = -8/5
HP = {(14/15, -8/5)}
b) x+y = 1 --> x = 1-y
substitusi
x-y = 1
(1-y)-y = 1
1-y-y = 1
-2y = 1-1
-2y = 0
y = 0
x = 1-y
x = 1-0
x = 1
hp = {(1,0)}
c) x+y = 5 --> x = 5-y
2x + 3y = 12
2(5-y)+3y = 12
10-2y+3y = 12
y = 12-10
y = 2
x = 5-y
x = 5-2
x = 3
hp = {(3,2)}
semoga membantu ya :)