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5a + 10b = 774 ↓ X 2 ↓= 10a + 20b = 1548
10a + 30b = 1618 ↓ X 1 ↓ = 10a + 30b = 1618 -
-10b = -70
b = -70/-10
b = 7
di subtitusikan ke persamaan 1
5a + 10b = 774
5a + 10 (7) = 774
5a + (70) = 774
5a = 774 - 70
5a = 704
a = 704/5
a = 140,8
smoga mmbntu :)
5a = 774 - 10b
a = (774 - 10b) / 5
a = 154,8 - 2b
10a + 30b = 1.618
10( 154,8 -2b) + 30b = 1.618
1.548 - 20b + 30b = 1.618
10b = 1.618-1.548
10b = 70
b = 70/10
b = 7
a = 154,8 - 2b
a= 154,8 - 2(7)
a = 154,8 - 14
a= 140,8