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In ax² + 2hxy = 0 (b = 0), one of the two lines is

AThe X-axis
BThe line y = x
CThe Y-axis
DThe line y = 1
Answer & Solution
Correct answer: C. The Y-axis
With b = 0 the equation factors as x(ax + 2hy) = 0, so x = 0, the Y-axis, is one line.
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