Diketahui 1/2x - 1/4y = 1 dan 1/5x - 2/5y = 1, maka nilai dari 2x - 2y adalah...
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Jawab:
Penjelasan dengan langkah-langkah:
(1/2) x - (1/4) y = 1
dikali 4
2x - y = 4
y = 2x - 4
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(1/5) x - (2/5) y = 1
dikali 5
x - 2y = 5
****************************************************
x - 2y = 5
x - 2 (2x - 4) = 5
x - 4x + 8 = 5
-3x = 5 - 8
x = -3 : -3
x = 1
****************************************************
y = 2x - 4
y = 2 . 1 - 4
y = -2
****************************************************
2x - 2y
= 2 . 1 - 2 . (-2)
= 2 + 4
= 6