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Diketahui :- y = - x + 4
- y = - 2x - 5
Ditanya : Nilai x dan y = .....?
Penyelesaian :
- Nilai x :
y = - x + 4
y + x = 4
x + y = 4
x + (- 2x - 5) = 4
x - 2x - 5 = 4
- x = 4 + 5
- x = 9
x = - 9
- Nilai y :
y = - x + 4
y = - (- 9) + 4
y = 9 + 4
y = 13
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