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2x + 5y = 21 (x3)
3x + 2y =15 (x2)
6x + 15y = 63
6x + 4y = 30
______________-
11y = 33
y = 3
3x + 2(3) = 15
3x = 15-6
x = 3
C. Metode Subtitusi
3x + 2y = 15
3(3) + 2 (3) = 9+6=15
Jadi x dan y = 3