General equation
Concept 9 of 9 in Pair of Straight Lines
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The lines y=xy = xy=x and y=−xy = -xy=−x make the pair x2−y2=0x^2 - y^2 = 0x2−y2=0. Slide both, without turning them, so that they cross at (1,3)(1, 3)(1,3). What is the new joint equation, and what is the angle now?
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