tolong dijawab please no 3
Matematika
ghariz1
Pertanyaan
tolong dijawab please no 3
1 Jawaban
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1. Jawaban cupid85
(3x - 7) / 5 - (y + 5) / 3 = 3
3(3x - 7) - 5(y + 5) = 3 (5 × 3)
9x - 21 - 5y - 25 = 3 × 15
9x - 5y = 45 + 46
9x - 5y = 91 ... pers 1
(x - 5) / 4 + (2y + 10) / 3 = 3
3(x - 5) + 4(2y + 10) = 3 (4 × 3)
3x - 15 + 8y + 40 = 3 × 12
3x + 8y = 36 - 25
3x + 8y = 11 ... pers 2
9x - 5y = 91
3x + 8y = 11 |×3
9x - 5y = 91
9x + 24y = 33
----------------------(-)
- 29y = 58
y = - 2
3x + 8y = 11
3x + 8(-2) = 11
3x = 11 + 16
3x = 27
x = 9
x = 9 dan y = - 2 (B)