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soal :
x + 2y = 4 dan x - y = 1
jawab :
i. x + 2y = 4
x = 0 --> x + 2y = 4
0 + 2y = 4
y = 4/2
= 2 --> ( 0,2 )
y = 0 --> x + 2y = 4
x + 2.0 = 4
x = 4 --> ( 4,0 )
ii. x - y = 1
x = 0 --> x - y = 1
0 - y = 1
y = -1 --> ( 0, -1)
y = 0 --> x - y = 1
x - 0 = 1
x = 1 --> ( 1,0 )
Titik potong ( 2,2 ).
Himpunan penyelesaian SPLDV {( 2,2 )}
2. Metode subsitusi
soal :
y = 2x dan 6x - y = 8
Jawab :
y = 2x
6x - y = 8
6x - ( 2x ) = 8
4x = 8
x = 8/4
= 2
y = 2x
= 2 ( 2 )
= 4
jadi,himpunan penyelesaian {( 2, 4 )}
3. Metode eliminasi
soal :
x + y = 8 dan x - y = 2
jawab :
x + y = 8
x - y = 2
_________ -
2y = 6
y = 3
x + y = 8
x - y = 2
_________ +
2x = 10
x = 5
jadi, himpunan penyelesaian SPLDV {( 5, 3 )}
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