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1) metode eleminasi
2x-3y=21 | x2 | 4x-6y = 42
5x+2y=5 | x3 | 15x+6y= 15 +
19x = 57
x = 57/19
x = 3
2)metode subsitusi
x=3 substitusikan ke pers 2x-3y = 21
2(6) - 3y =21
-3y = 21-12
y = 9/-3
y = -3