Question

X=2y+9dan 3x+4y=7 dengan metode eliminasi

Answer 1

》Sistem Persamaan Dua Variabel








Eliminasi

x - 2y = 9 [ × 3 ]
3x + 4y = 7 [ × 1 ]

3x - 6y = 27
3x + 4y = 7
---------------- --
- 10y = 20
y = - 2



Eliminasi

x - 2y = 9 [ × 2 ]
3x + 4y = 7 [ × 1 ]

2x - 4y = 18
3x + 4y = 7
---------------- +
5x = 25
x = 5


HP = { 5 , - 2 }

Answer 2

X=2y+9 -> x-2y=9 (pindah ruas)
x-2y=9. |*2
3x+4y=7 |*1
2x-4y=18
3x+4y=7
________+
5x=25
x=5
x-2y=9. |*3
3x+4y=7.|*1
3x-6y=27
3x+4y=7
________-
-10y=20
y=-2
HP={(5,-2)}