Tentukan himpunan penyelesaian sistem persamaan berikut dengan menggunakan metode eliminasi,jika x dan y variabel pada himpunan bilangan real 1. x+y=1 dan x + 5y=5 2. 3x + 2y = 12 dan 2x-y=8 5. x + y = 12 dan 3x -y = 4 6. x+2y= 4 dan 2x - y = 3
PositiveThinking
1. x + y = 1 x + 5y = 5 --------------- - -4y = -4 y = -4/-4 y = 1
x + 5y = 5
--------------- -
-4y = -4
y = -4/-4
y = 1
x + y = 1
x + 1 = 1
x = 1 - 1
x = 0
HP = (x,y) = (0 , 1)
2. 3x + 2y = 12 x1 3x + 2y = 12
2x - y = 8 x2 4x - 2y = 16
------------------ +
7x = 28
x = 28/7
x = 4
3x + 2y = 12
3.4 + 2y = 12
12 + 2y = 12
2y = 12 - 12
2y = 0
y = 0/2
y = ∞
HP = (x,y) = (4 , ∞)
5. x + y = 12
3x - y = 4
--------------- +
4x = 16
x = 16/4
x = 4
x + y = 12
4 + y = 12
y = 12 - 4
y = 8
HP = (x,y) = (4 , 8)
6. x + 2y = 4 x1 x + 2y = 4
2x - y = 3 x 2 4x - 2y = 6
---------------- +
5x = 10
x = 10/5
x = 2
x + 2y = 4
2 + 2y = 4
2y = 4 - 2
2y = 2
y = 2/2
y = 1
HP = (x,y) = (2 , 1)
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