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Two lines through the origin have a joint equation that is always of which type?

ALinear in x and y
BHomogeneous, degree two
CCubic in x and y
DCircle in x and y
Answer & Solution
Correct answer: B. Homogeneous, degree two
Multiplying (a1x + b1y)(a2x + b2y) leaves only x², xy and y² terms.
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