1. Jika x dan y merupakan selesaian dari 2x - 5y = 16 4x + 3y = -7 maka nilai dari 2x - y adalah
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Jawab:
Penjelasan dengan langkah-langkah:
2x - 5y = 16 (×2)
4x + 3y = -7 (×1)
4x - 10y = 32
4x + 3y = -7 _
-13y = 39
y = 39/(-13)
y = -3
2x - 5(-3) = 16
2x + 15 = 16
2x = 16 - 15
2x = 1
x = ½
2x - y = 2(½) - (-3)
2x - y = 1 + 3
2x - y = 4
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