a1x+b1y+c1=0a_1 x + b_1 y + c_1 = 0a1x+b1y+c1=0 a2x+b2y+c2=0a_2 x + b_2 y + c_2 = 0a2x+b2y+c2=0
x=b1c2−b2c1a1b2−a2b1x = \frac{b_1 c_2 - b_2 c_1}{a_1 b_2 - a_2 b_1}x=a1b2−a2b1b1c2−b2c1, y=c1a2−c2a1a1b2−a2b1y = \frac{c_1 a_2 - c_2 a_1}{a_1 b_2 - a_2 b_1}y=a1b2−a2b1c1a2−c2a1
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