Tolong bantuin caranya. 1. nilai a yang memenuhi persamaan 5x - 8y + az = 134 jika diketahui nilai x = 20, y = -5, z= -2 adalah... 2. Nilai b yang memenuhi persamaan x + 2by + 4z = -65, jika diketahui nilai (x+y) = -15, z = 10, (x+z) = 5 adalah...
Komentar (3)
5x - 8 y + az = 134 5. 20 - 8. -5 + a.-2 =134 100+ 40 - 2a = 134 -2a = 134-100-40 -2a = -6 a = -6/2 a = -3
no.2 X + y + 2b +4 z = -65 X + y + 2b +40 = -65 15 + 40 + 2b = -65 55 + 2b = -65 2b = -65 -55 2 b = -120 b = -120/2 b = -60 semoga benar
5. 20 - 8. -5 + a.-2 =134
100+ 40 - 2a = 134
-2a = 134-100-40
-2a = -6
a = -6/2
a = -3
no.2
X + y + 2b +4 z = -65
X + y + 2b +40 = -65
15 + 40 + 2b = -65
55 + 2b = -65
2b = -65 -55
2 b = -120
b = -120/2
b = -60
semoga benar