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x - 2y = -3 ..... pers. 1
2x + y = 4 ..... pers. 2
pers. 1 diubah menjadi x = 2y - 3 dan dimisalkan menjadi pers. 3
2x + y = 4
2 (2y - 3) + y = 4
4y - 6 + y = 4
5y = 10
y = 2
2x + y = 4
2 x + 2 = 4
2 x + 2 = 4
2x = 2
x= 1
metode eliminasi
x - 2y = -3 (dikali 2) 2x - 4y = -6
2x + y = 4 (dikali 1) 2x + y = 4
--------------------- -
-5y = -10
y = 2
x - 2y = -3 (dikali 1) x - 2y = -3
2x + y = 4 (dikali 2) 4x + 2y = 8
------------------ +
5x = 5
x = 1
metode campuran
x - 2y = -3 (dikali 2) 2x - 4y = -6
2x + y = 4 (dikali 1) 2x + y = 4
--------------------- -
-5y = -10
y = 2
x - 2y = -3
x - 2 (2) = -3
x - 4 = -3
x = 1
maaf, cara grafiknya lupa caranya