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a = 2b + 4
(masukkan ke persamaan pertama)
(2b + 4) + b = 28
3b + 4 = 28
3b = 28 - 4
3b = 24
b = 24/3 = 8
a = 2b + 4
= 2x8 + 4
= 16 + 4
=20
a= 2b+4
maka
(2b+4) +b = 28
3b +4 = 28
3b = 28-4 =24
b = 24/3 = 8
a = 2b+4 = 2(8) +4 = 16+4=20