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2x+y=6
=2x+6y=21
itu aja...
(ii) 2x + y = 6 → ( dikali 2)
4x + 7y = 27
4x + 2y = 12
__________ _ ( dikurangin )
5y = 15
y = 3
nilai y=3 disubstitusikan ke pers. (ii)
2x + y = 6
2x + 3 = 6
2x = 3
x = 3/2
Jadi nilai x = 3/2 dan nilai y = 3