Algebrahard · Past Paper
If 1/x + 2/y = 4 and 3/x - 1/y = 5, find x.
A1/2
B2
C1/3
D3
✓ Correct Answer: A — 1/2
u+2v=4, 3u-v=5. Multiply second by 2: 6u-2v=10. Add: 7u=14 -> u=2. x = 1/u = 1/2.
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✓ Correct Answer: A — 1/2
u+2v=4, 3u-v=5. Multiply second by 2: 6u-2v=10. Add: 7u=14 -> u=2. x = 1/u = 1/2.
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