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a-b=4
2a+b=11
kemudian,kita pakai metode eliminasi
a-b=4
2a+b=11
__________+
3a =15
a=15:3=5
kemudian,kita substitusikan ke persamaan a-b=4
a=5
a-b=4
5-b=4
↔b=5-4
b=1
2a + b = 11
dit : a dan b ?
jawab :
a - b = 4
a = 4 + b
subtitusi ke pers. 2
2a + b = 11
2 (4 + b) + b = 11
8 + 2b + b = 11
8 + 3 b = 11
3b = 11 - 8
3b = 3
b = 1
subtitusi b ke pers 1
a - b = 4
a - 1 = 4
a = 4+1
a = 5
jawabannya a = 5
b = 1
itu menurut saya :)