U9=7 U11=21 tentukan U5 beserta caranya tolong

[tex]21 - 7 = 14 \\ 9 - 11 = 2 \\ 14 \div 2 = 7 \\ 7 \times 4 - 7 = 7 - 28 \\ = - 21 \\ u5 = - 21[/tex]

dik : U9 = a + 8b = 7
U11 = a + 10b = 21
dit : U5
jawab : pakai cara eliminasi
U11 = a + 10b = 21
U9 = a + 8b = 7
———————— -
2b = 14
b = 14/2 = 7

substitusikan ke a + 8b
a + 8b = 7
a + 8(7) = 7
a + 56 = 7
a = 7-56
a = -49

U5 = a + 4b
= -49 + 4(7)
= -49 + 28
= -21

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