Arithmetichard · Past Paper
If x^2 + 4y^2 = 4xy, find the ratio x:y.
A2:1
B1:2
C1:1
D4:1
✓ Correct Answer: A — 2:1
x^2 - 4xy + 4y^2 = 0 => (x-2y)^2 = 0 => x = 2y. So x:y = 2:1.
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