8/× + 8/y = 6
Nilai dari 2x+y=…
A. 4
B. 8
C. 12
D. 16
/ = per
6/x + 12/y = 6
Jawaban Terkonfirmasi
Kelas 8 Matematika
Bab SPLDV
1/x = a
1/y = b
6a + 12b = 6 → dibagi 3 → 2a + 4b = 2
8a + 8b = 6 → dibagi 2 → 4a + 4b = 3
4a + 4b = 3
2a + 4b = 2
—————– –
2a = 1
a = 1/2
2a + 4b = 2
2 . 1/2 + 4b = 2
4b = 2 – 1
b = 1/4
a = 1/2
1/x = 1/2
x = 2
b = 1/4
1/y = 1/4
y = 4
2x + y
= 2 . 2 + 4
= 4 + 4
= 8