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Question
Find the joint equation of the line:
x + y - 3 = 0 and 2x + y - 1 = 0
Solution
Find the joint equation of the line x + y - 3 = 0 and 2x + y - 1 = 0
(x + y - 3)(2x + y - 1) = 0
∴ 2x2 + xy - x + 2xy + y2 - y - 6x - 3y + 3 = 0
∴ 2x2 + 3xy + y2 - 7x - 4y + 3 = 0
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